Helium (He)
noble-gasGas
प्रमाणित अणुभार
4.002602 uइलेक्ट्रॉन संरूपण
1s2द्रवणांक
-272.2 °Cउत्कलनांक
-268.93 °Cघनता
0.1785 kg/m³ऑक्सिडीकरण अवस्था
0विद्युतऋणता (पॉलिंग)
उपलब्ध नाहीआयनीकरण ऊर्जा (पहिली)
24.587389 eVशोधाचे वर्ष
1868अणुत्रिज्या
120 pmतपशील
Helium is a noble gas and the second element in the periodic table. It is chemically inert under ordinary conditions because its 1s electron shell is filled, and it exists as monatomic He rather than as a molecule. Its low density, very low boiling point, high thermal conductivity, and nonflammability make it technologically important. On Earth it is uncommon in the atmosphere but can accumulate in some natural gas reservoirs through radioactive decay of uranium and thorium.
Helium has the lowest melting point of any element and is widely used in cryogenic research because its boiling point is close to absolute zero. Also, the element is vital in the study of super conductivity.
Using liquid helium, Kurti, co-workers and others have succeeded in obtaining temperatures of a few microkelvins by the adiabatic demagnetization of copper nuclei.
Helium has other peculiar properties: It is the only liquid that cannot be solidified by lowering the temperature. It remains liquid down to absolute zero at ordinary pressures, but will readily solidify by increasing the pressure. Solid 3He and 4He are unusual in that both can be changed in volume by more than 30% by applying pressure.
The specific heat of helium gas is unusually high. The density of helium vapor at the normal boiling point is also very high, with the vapor expanding greatly when heated to room temperature. Containers filled with helium gas at 5 to 10 K should be treated as though they contained liquid helium due to the large increase in pressure resulting from warming the gas to room temperature.
While helium normally has a 0 valence, it seems to have a weak tendency to combine with certain other elements. Means of preparing helium difluoride have been studied, and species such as HeNe and the molecular ions He+ and He++ have been investigated.
The name derives from the Greek helios for "sun". The element was discovered by spectroscopy during a solar eclipse in the sun's chromosphere by the French astronomer Pierre-Jules-Cesar Janssen in 1868. It was independently discovered and named helium by the English astronomer Joseph Norman Lockyer.
Helium was thought to be only a solar constituent until it was later found to be identical to the helium in the uranium ore cleveite by the Scottish chemist William Ramsay in 1895. The Swedish chemists Per Theodore Cleve and Nils Abraham Langet independently found helium in cleveite at about the same time.
Helium, the second most abundant element in the universe, was discovered on the sun before it was found on the earth. Pierre-Jules-César Janssen, a French astronomer, noticed a yellow line in the sun's spectrum while studying a total solar eclipse in 1868. Sir Norman Lockyer, an English astronomer, realized that this line, with a wavelength of 587.49 nanometers, could not be produced by any element known at the time. It was hypothesized that a new element on the sun was responsible for this mysterious yellow emission. This unknown element was named helium by Lockyer. The hunt to find helium on earth ended in 1895. Sir William Ramsay, a Scottish chemist, conducted an experiment with a mineral containing uranium called clevite. He exposed the clevite to mineral acids and collected the gases that were produced. He then sent a sample of these gases to two scientists, Lockyer and Sir William Crookes, who were able to identify the helium within it. Two Swedish chemists, Nils Langlet and Per Theodor Cleve, independently found helium in clevite at about the same time as Ramsay.
Helium makes up about 0.0005% of the earth's atmosphere. This trace amount of helium is not gravitationally bound to the earth and is constantly lost to space. The earth's atmospheric helium is replaced by the decay of radioactive elements in the earth's crust. Alpha decay, one type of radioactive decay, produces particles called alpha particles. An alpha particle can become a helium atom once it captures two electrons from its surroundings. This newly formed helium can eventually work its way to the atmosphere through cracks in the crust.
From the Greek word helios, the sun. Janssen obtained the first evidence of helium during the solar eclipse of 1868 when he detected a new line in the solar spectrum. Lockyer and Frankland suggested the name helium for the new element. In 1895 Ramsay discovered helium in the uranium mineral cleveite while it was independently discovered in cleveite by the Swedish chemists Cleve and Langlet at about the same time. Rutherford and Royds in 1907 demonstrated that alpha particles are helium nuclei.
Pure helium is a colorless, odorless, tasteless gas at ordinary temperature and pressure. It liquefies only at very low temperature and does not freeze at normal pressure, remaining liquid down to absolute zero unless compressed. Liquid helium is clear and highly mobile.
Helium is used where an inert, light, and very cold fluid is needed. Liquid helium cools superconducting magnets in magnetic resonance imaging, particle accelerators, and low-temperature research. Gaseous helium is used as a shielding gas in specialized welding, as a leak-detection tracer, as a pressurizing and purging gas for rockets and cryogenic systems, and as a carrier gas in gas chromatography. Helium also fills balloons and airships when nonflammability is more important than lift efficiency. Helium-3 is used in neutron detection, cryogenic research, and some specialized physics experiments, but its supply is limited.
Helium is commercially recovered from natural gas deposits, mostly from Texas, Oklahoma and Kansas. Helium gas is used to inflate blimps, scientific balloons and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets and in supersonic windtunnels. Helium is combined with oxygen to create a nitrogen free atmosphere for deep sea divers so that they will not suffer from a condition known as nitrogen narcosis. Liquid helium is an important cryogenic material and is used to study superconductivity and to create superconductive magnets. The Department of Energy's Jefferson Lab uses large amounts of liquid helium to operate its superconductive electron accelerator.
Helium is an inert gas and does not easily combine with other elements. There are no known compounds that contain helium, although attempts are being made to produce helium diflouride (HeF2).
▸ as an inert gas shield for arc welding;
▸ a protective gas in growing silicon and germanium crystals and producing titanium and zirconium;
▸ as a cooling medium for nuclear reactors, and
▸ as a gas for supersonic wind tunnels.
A mixture of helium and oxygen is used as an artificial atmosphere for divers and others working under pressure. Different ratios of He and O2 are used for different diver operation depths.
Helium is extensively used for filling balloons as it is a much safer gas than hydrogen. One of the recent largest uses for helium has been for pressuring liquid fuel rockets. A Saturn booster, like the type used on the Apollo lunar missions, required about 13 million ft3 of helium for a firing, plus more for checkouts.
Liquid helium's use in magnetic resonance imaging (MRI) continues to increase as the medical profession accepts and develops new uses for the equipment. This equipment has eliminated some need for exploratory surgery by accurately diagnosing patients. Another medical application uses MRE to determine (by blood analysis) whether a patient has any form of cancer.
Helium is also being used to advertise on blimps for various companies, including Goodyear. Other lifting gas applications are being developed by the Navy and Air Force to detect low-flying cruise missiles. Additionally, the Drug Enforcement Agency is using radar-equipped blimps to detect drug smugglers along the United States boarders. In addition, NASA is currently using helium-filled balloons to sample the atmosphere in Antarctica to determine what is depleting the ozone layer.
Isotopes in Geochronology
3He is a product of the radioactive decay of 3H (half-life of 12.31 years). The relative variations in the amount ratio n(3He)/n(3H) can be interpreted in terms of elapsed time. This has been especially useful in aquatic systems, including oceans, lakes, and aquifers, that received large inputs of 3H from precipitation following thermonuclear bomb test periods. 3H- 3He dating provides the elapsed time since a water mass became isolated from the atmosphere in the time range from the mid-1950s to the present. Such studies are important for establishing the sustainability of groundwater resources in shallow aquifers [27] D. K. Solomon, P. G. Cook. “3H and 3He”, in Environmental Tracers in Subsurface Hydrology, P. G. Cook and A. L. Herczeg (Eds.), Kluwer Academic Publishers, Boston (2000)., [28] P. Schlosser, M. Stute, H. Dörr, C. Sonntag, K. O. Münnich. Earth Planet. Sci. Lett.89, 353 (1988)..
4He is a product of radioactive decay in the uranium and thorium decay series. As a result, 4He concentration is used to estimate the relative ages of minerals and groundwater. In closed systems (systems that do not exchange matter with their surroundings), relative variations in the amount ratio n(4He)/n(U) can be interpreted in terms of elapsed time, although other processes can alter the distribution of helium, which is highly mobile in terrestrial environments [29] M. Ozima, F. A. Podosek. Noble Gas Geochemistry: 2nd Edition, p. 286, Cambridge University Press, Cambridge, UK (2002)., [30] D. K. Solomon. “4He in groundwater”, in Environmental Tracers in Subsurface Hydrology, P. G. Cook and A. L. Herczeg (Eds.), Kluwer Academic Publishers, Boston (2000)..
4He concentrations commonly increase along groundwater flow paths through a cumulative release from aquifer materials. This rate of accumulation is used to estimate the time since the groundwater was recharged at the surface. The 4He accumulation method of groundwater dating is typically used in deeper aquifers, where groundwater is relatively old and the 3H- 3He method cannot be used because of the relatively short half-life of 12.31 years for 3H [30] D. K. Solomon. “4He in groundwater”, in Environmental Tracers in Subsurface Hydrology, P. G. Cook and A. L. Herczeg (Eds.), Kluwer Academic Publishers, Boston (2000)..
Isotopes in Industry
3He has a large absorption cross section for neutrons, which makes it especially useful for radioactivity detection [31] D. Kramer. Phys. Today63, 22 (2010)., [32] G. V. Jean. Advancing Hidden Nuclear Material Detection, National Defense Industrial Association (2014), Feb. 28; http://www.nationaldefensemagazine.org/archive/2010/December/Pages/AdvancingHiddenNuclearMaterialDetection.aspx.. In this application, neutrons produced by the radioactive decay of elements, such as uranium and plutonium, enter the detector, where the reaction 3He (n, p) 3H produces 1H and 3H atoms. This induces further collisions and the release of electrons, which interact with charged surfaces to generate an electric current. Large amounts of 3He are used to produce neutron detectors in portal monitors for detecting illicit radioactive materials at ports, border crossings, and airports (Fig. IUPAC.2.1). Unfortunately, the isotope 3He is rare and there is a need to incorporate alternative gases for use in neutron detectors. 3He neutron detectors are also used in devices that determine the proportions of water, oil, and gas in wells drilled for energy production. Other important uses of 3He include lasers, gyroscopes used for missile stability and guidance, and cryogenic research (ultra-low temperature, less than 1 K).
The global supply of 3He available for research and practical applications has become severely limited in recent years, such that prices have increased substantially and some uses have been curtailed [31] D. Kramer. Phys. Today63, 22 (2010)., [32] G. V. Jean. Advancing Hidden Nuclear Material Detection, National Defense Industrial Association (2014), Feb. 28; http://www.nationaldefensemagazine.org/archive/2010/December/Pages/AdvancingHiddenNuclearMaterialDetection.aspx.. A major source of 3He is from nuclear weapons containing 3H, recovered when the warheads are reconditioned or dismantled. 3He accumulates in such devices as a radiogenic product of 3H decay. The annual supply of new 3He has decreased with reductions in nuclear arsenals.
Isotopes in Medicine
3He is used as an inhalant to improve magnetic resonance imaging (MRI) of the lungs [34] M. Ebert, T. Grossmann, W. Heil, E. W. Otten, R. Surkau, M. Thelen, M. Leduc, P. Bachert, M. V. Knopp, L. R. Schad. Lancet347, 1297 (1996)..
Helium has no stable neutral compounds under ordinary chemical conditions. Its closed-shell atom has an extremely high ionization energy and very low polarizability, so conventional covalent or ionic chemistry is absent. Excited helium can form transient species such as the helium dimer ion He₂⁺ and excimers in plasmas. Under high pressure, helium can enter crystalline inclusion compounds and van der Waals solids; sodium helide, often written Na₂He, has been reported as a high-pressure electride rather than a normal valence compound. These phases are not examples of everyday helium chemistry.
See more information at the Helium compound page.
Helium is not toxic and is not flammable, but it can displace oxygen in confined spaces and cause asphyxiation without warning. Compressed helium cylinders present mechanical hazards if mishandled. Liquid helium can cause severe cold burns and can rapidly expand to large gas volumes, creating pressure and oxygen-deficiency risks. Inhalation to alter the voice is dangerous because it can deprive the body of oxygen or cause pressure injury from cylinders.
Most terrestrial helium is produced by alpha decay in rocks; alpha particles become helium nuclei and then neutral atoms. Because helium is light and unreactive, it migrates through rocks, dissolves only weakly in water, and eventually escapes from the atmosphere to space. Commercially recoverable accumulations require suitable source rocks and trapping structures, often associated with natural gas fields. Helium has no known biological requirement and little direct chemical ecological effect.
Helium is recovered chiefly as a by-product from natural gas streams that contain unusually high helium concentrations. Separation commonly uses cryogenic processing, pressure-swing adsorption, or membrane methods after removal of major gases. Supply is constrained by geology, gas-field development, purification capacity, storage, and transport of either compressed gas or cryogenic liquid. Demand is led by cryogenics, especially superconducting magnets, with additional use in leak detection, analytical instrumentation, welding, and aerospace systems. Recycling is technically valuable in laboratories and large facilities but is not universal, because capture and reliquefaction require specialized equipment.
Except for hydrogen, helium is the most abundant element found in the universe. Helium is extracted from natural gas. In fact, all natural gas contains at least trace quantities of helium.
It has been detected spectroscopically in great abundance, especially in the hotter stars, and it is an important component in both the proton-proton reaction and the carbon cycle, which account for the energy of the sun and stars.
The helium content of the atmosphere is about 1 part in 200,000. While it is present in various radioactive minerals as a decay product, the bulk of the Free World's supply is obtained from wells in Texas, Oklahoma, and Kansas. Outside the United States, the only known helium extraction plants, in 1984 were in Eastern Europe (Poland), the USSR, and a few in India.
Helium is one of the most abundant elements in the universe. Most ⁴He was formed during Big Bang nucleosynthesis, and more is produced by hydrogen fusion in stars. It is a major constituent of the Sun and gas giant planets. On rocky planets, atmospheric helium is usually depleted because neutral helium can escape gravitationally over geologic time.
- Helium was first identified in the solar spectrum before it was isolated on Earth.
- At normal pressure, helium is the only element that does not solidify by cooling alone.
- Liquid ⁴He becomes a superfluid below the lambda point near 2.17 K.
- Helium has a negative Joule-Thomson coefficient above its inversion temperature, so it can warm during throttling at the
प्रतिमा
गुणधर्म
भौतिक
- अणुत्रिज्या (अनुभवाधारित)
- 120 pm सर्व घटकांच्या अणुत्रिज्या (अनुभवाधारित) ची तुलना करा →
- सहसंयुजी त्रिज्या
- 28 pm सर्व घटकांच्या सहसंयुजी त्रिज्या ची तुलना करा →
- व्हॅन डर वाल्स त्रिज्या
- 140 pm सर्व घटकांच्या व्हॅन डर वाल्स त्रिज्या ची तुलना करा →
- घनता
- 0.1785 kg/m³ सर्व घटकांच्या घनता ची तुलना करा →
- मोलर आयतन
- 0.0318 L/mol
- STP येथे अवस्था
- वायू सर्व घटकांच्या STP येथे अवस्था ची तुलना करा →
- द्रवणांक
- -272.2 °C सर्व घटकांच्या द्रवणांक ची तुलना करा →
- उत्कलनांक
- -268.93 °C सर्व घटकांच्या उत्कलनांक ची तुलना करा →
- उष्णता चालकता
- 0.152 W/(m·K) सर्व घटकांच्या उष्णता चालकता ची तुलना करा →
- विशिष्ट उष्माधारकता
- 5.193 J/(g·K) सर्व घटकांच्या विशिष्ट उष्माधारकता ची तुलना करा →
- मोलर उष्माधारकता
- 20.786 J/(mol·K) सर्व घटकांच्या मोलर उष्माधारकता ची तुलना करा →
- स्फटिक संरचना
- षट्कोणी निकट-संकुलित सर्व घटकांच्या स्फटिक संरचना ची तुलना करा →
रासायनिक
- विद्युतऋणता (ॲलन)
- 4.16
- इलेक्ट्रॉन आसक्ती
- -0.5 eV (नकारात्मक मूल्य — अणूने अतिरिक्त इलेक्ट्रॉन बांधण्याचा अंदाज नाही)
- आयनीकरण ऊर्जा (पहिली)
- 24.587389 eV सर्व घटकांच्या आयनीकरण ऊर्जा (पहिली) ची तुलना करा →
- आयनीकरण ऊर्जा (दुसरी)
- 54.417953 eV सर्व घटकांच्या आयनीकरण ऊर्जा (दुसरी) ची तुलना करा →
- ऑक्सिडीकरण अवस्था
- 0 सर्व घटकांच्या ऑक्सिडीकरण अवस्था ची तुलना करा →
- संयुजा इलेक्ट्रॉन
- 2 सर्व घटकांच्या संयुजा इलेक्ट्रॉन ची तुलना करा →
- इलेक्ट्रॉन संरूपण
- 1s2
उष्मागतिक
- त्रिक बिंदू (तापमान)
- -270.973 °C
- त्रिक बिंदू (दाब)
- 5043 Pa
- क्रांतिक बिंदू (तापमान)
- -267.955 °C
- क्रांतिक बिंदू (दाब)
- 2.2746e+5 Pa
- द्रवण उष्मा
- 1.430274e-4 eV सर्व घटकांच्या द्रवण उष्मा ची तुलना करा →
- बाष्पीभवन उष्मा
- 8.291444e-4 eV सर्व घटकांच्या बाष्पीभवन उष्मा ची तुलना करा →
- अणूकरण उष्मा
- 0 eV
केंद्रकीय
- प्रोटॉन
- 2 सर्व घटकांच्या प्रोटॉन ची तुलना करा →
- न्यूट्रॉन
- 2 सर्व घटकांच्या न्यूट्रॉन ची तुलना करा →
- ज्ञात समस्थानिके
- 8 सर्व घटकांच्या ज्ञात समस्थानिके ची तुलना करा →
- स्थिर समस्थानिके
- 2 सर्व घटकांच्या स्थिर समस्थानिके ची तुलना करा →
- सर्वाधिक स्थिर समस्थानिक
- He-4
- शोधाचे वर्ष
- 1868
विपुलता
- विपुलता (पृथ्वीचे कवच)
- 0.008 mg/kg सर्व घटकांच्या विपुलता (पृथ्वीचे कवच) ची तुलना करा →
- विपुलता (महासागर)
- 7 × 10−6 mg/L सर्व घटकांच्या विपुलता (महासागर) ची तुलना करा →
स्फटिक संरचना
- जालक स्थिरांक a
- 357 pm
इलेक्ट्रॉन संरचना
- प्रत्येक कवचातील इलेक्ट्रॉन
- 2 सर्व घटकांच्या प्रत्येक कवचातील इलेक्ट्रॉन ची तुलना करा →
ओळखचिन्हे
- CAS क्रमांक
- 7440-59-7 सर्व घटकांच्या CAS क्रमांक ची तुलना करा →
- टर्म चिन्ह
- 1S0
- InChI
- InChI=1S/He
- InChI की
- SWQJXJOGLNCZEY-UHFFFAOYSA-N
इलेक्ट्रॉन संरूपण मोजलेले
He: 1s²1s²1s²अणुप्रतिमान
समस्थानिकांमुळे न्यूट्रॉन संख्या, वस्तुमान आणि स्थैर्य बदलते — विद्युतदृष्ट्या उदासीन अणूचे इलेक्ट्रॉन संरूपण बदलत नाही.
योजनात्मक अणुप्रतिमान, प्रमाणानुसार नाही.
अणूची विशिष्ट ओळख
उत्सर्जन / शोषण वर्णपट
समस्थानिक वितरण
| वस्तुमानांक | अणुवस्तुमान (u) | नैसर्गिक विपुलता | अर्धायुष्य |
|---|---|---|---|
| 3 स्थिर | ३.०१६०२९३२०१ ± ०.००००००००२५ | 0.0001% | स्थिर |
| 4 स्थिर | ४.००२६०३२५४१३ ± ०.००००००००००६ | 99.9999% | स्थिर |
अवस्था / स्थिती
कारण: उत्कलनांकापेक्षा (-268.93 °C) 293.9 °C अधिक
योजनात्मक, प्रमाणानुसार नाही
अवस्थांतर बिंदू
अवस्थांतर ऊर्जा
द्रवणांकावर 1 mol वितळवण्यासाठी आवश्यक ऊर्जा
उत्कलनांकावर 1 mol चे बाष्पीभवन करण्यासाठी आवश्यक ऊर्जा
घनता
प्रमाणित परिस्थितीत
सध्याच्या T येथे आदर्श वायू नियमाने अंदाजित
प्रगत
अणुवर्णपट
वर्णरेषांचा संग्रह ?
| आयन | विद्युतभार | एकूण वर्णरेषा | संक्रमण संभाव्यता | पातळ्यांची नामांकने |
|---|---|---|---|---|
| 3He I समस्थानिक | 0 | 2289 | 0 | 2289 |
| He I | 0 | 2300 | 2289 | 2300 |
| He II | +1 | 140 | 140 | 140 |
| 3He II समस्थानिक | +1 | 140 | 140 | 140 |
ऊर्जा पातळ्यांचा संग्रह ?
| आयन | विद्युतभार | पातळ्या |
|---|---|---|
| 3He I समस्थानिक | 0 | 188 |
| He I | 0 | 843 |
| He II | +1 | 149 |
| 3He II समस्थानिक | +1 | 149 |
संयुगे
समस्थानिके (2)
Seven isotopes of helium are known: Liquid helium (He-4) exists in two forms: He-4I and He-4II, with a sharp transition point at 2.174K. He-4I (above this temperature) is a normal liquid, but He-4II (below it) is unlike any other known substance. It expands on cooling, its conductivity for heat is enormous, and neither its heat conduction nor viscosity obeys normal rules.
| वस्तुमानांक | अणुवस्तुमान (u) | नैसर्गिक विपुलता | अर्धायुष्य | क्षय प्रकार | |
|---|---|---|---|---|---|
| 3 स्थिर | ३.०१६०२९३२०१ ± ०.००००००००२५ | 0.0001% ± 0.0000% | स्थिर | stable | |
| 4 स्थिर | ४.००२६०३२५४१३ ± ०.००००००००००६ | 99.9999% ± 0.0000% | स्थिर | stable |
वर्णरेषा
| तरंगलांबी (nm) | तीव्रता | आयनीकरण टप्पा | प्रकार | संक्रमण | अचूकता | स्रोत | |
|---|---|---|---|---|---|---|---|
| 381.9601975 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 381.9602773 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 381.9602828 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 381.9613129 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 381.9613927 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 381.975731 nm | 1 | He I | emission | 1s.2p 3P* → 1s.6d 3D | मोजलेले | NIST | |
| 383.3548713 nm | 0 | He I | emission | 1s.2p 1P* → 1s.10d 1D | मोजलेले | NIST | |
| 383.8100125 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.10s 1S | मोजलेले | NIST | |
| 386.7472343 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6s 3S | मोजलेले | NIST | |
| 386.7483778 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.6s 3S | मोजलेले | NIST | |
| 386.7631595 nm | 1 | He I | emission | 1s.2p 3P* → 1s.6s 3S | मोजलेले | NIST | |
| 387.1786406 nm | 1 | He I | emission | 1s.2p 1P* → 1s.9d 1D | मोजलेले | NIST | |
| 387.8176858 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.9s 1S | मोजलेले | NIST | |
| 388.8604644 nm | उपलब्ध नाही | He I | emission | 1s.2s 3S → 1s.3p 3P* | मोजलेले | NIST | |
| 388.864559 nm | उपलब्ध नाही | He I | emission | 1s.2s 3S → 1s.3p 3P* | मोजलेले | NIST | |
| 388.8648915 nm | उपलब्ध नाही | He I | emission | 1s.2s 3S → 1s.3p 3P* | मोजलेले | NIST | |
| 392.6544387 nm | 1 | He I | emission | 1s.2p 1P* → 1s.8d 1D | मोजलेले | NIST | |
| 393.5945223 nm | 0 | He I | emission | 1s.2p 1P* → 1s.8s 1S | मोजलेले | NIST | |
| 396.4728829 nm | 20 | He I | emission | 1s.2s 1S → 1s.4p 1P* | मोजलेले | NIST | |
| 397.2015454 nm | उपलब्ध नाही | He I | emission | 1s.2s 1S → 1s.4d 1D | मोजलेले | NIST | |
| 400.9256516 nm | 1 | He I | emission | 1s.2p 1P* → 1s.7d 1D | मोजलेले | NIST | |
| 402.3979795 nm | 1 | He I | emission | 1s.2p 1P* → 1s.7s 1S | मोजलेले | NIST | |
| 402.6184368 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 402.6185901 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 402.6186005 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 402.619676 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 402.6198294 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 402.6356959 nm | 5 | He I | emission | 1s.2p 3P* → 1s.5d 3D | मोजलेले | NIST | |
| 412.0810765 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5s 3S | मोजलेले | NIST | |
| 412.0823747 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.5s 3S | मोजलेले | NIST | |
| 412.0991564 nm | 2 | He I | emission | 1s.2p 3P* → 1s.5s 3S | मोजलेले | NIST | |
| 414.1332157 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.6p 1P* | मोजलेले | NIST | |
| 414.3759059 nm | 3 | He I | emission | 1s.2p 1P* → 1s.6d 1D | मोजलेले | NIST | |
| 416.8971512 nm | 1 | He I | emission | 1s.2p 1P* → 1s.6s 1S | मोजलेले | NIST | |
| 438.3278555 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.5p 1P* | मोजलेले | NIST | |
| 438.7929143 nm | 10 | He I | emission | 1s.2p 1P* → 1s.5d 1D | मोजलेले | NIST | |
| 443.7553428 nm | 3 | He I | emission | 1s.2p 1P* → 1s.5s 1S | मोजलेले | NIST | |
| 447.1470373 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 447.1474077 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 447.1474317 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 447.1485658 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 447.1489362 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 447.1683251 nm | 25 | He I | emission | 1s.2p 3P* → 1s.4d 3D | मोजलेले | NIST | |
| 468.537685 nm | उपलब्ध नाही | He II | emission | 3p 2P* → 4d 2D | मोजलेले | NIST | |
| 468.5407226 nm | उपलब्ध नाही | He II | emission | 3s 2S → 4p 2P* | मोजलेले | NIST | |
| 468.5524404 nm | उपलब्ध नाही | He II | emission | 3p 2P* → 4s 2S | मोजलेले | NIST | |
| 468.5568006 nm | उपलब्ध नाही | He II | emission | 3s 2S → 4p 2P* | मोजलेले | NIST | |
| 468.570385 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4f 2F* | मोजलेले | NIST | |
| 468.570438 nm | उपलब्ध नाही | He II | emission | 3p 2P* → 4d 2D | मोजलेले | NIST | |
| 468.575708 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4p 2P* | मोजलेले | NIST | |
| 468.5757975 nm | उपलब्ध नाही | He II | emission | 3p 2P* → 4d 2D | मोजलेले | NIST | |
| 468.5804092 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4f 2F* | मोजलेले | NIST | |
| 468.583089 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4f 2F* | मोजलेले | NIST | |
| 468.5884123 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4p 2P* | मोजलेले | NIST | |
| 468.5905553 nm | उपलब्ध नाही | He II | emission | 3p 2P* → 4s 2S | मोजलेले | NIST | |
| 468.5917885 nm | उपलब्ध नाही | He II | emission | 3d 2D → 4p 2P* | मोजलेले | NIST | |
| 471.3139173 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4s 3S | मोजलेले | NIST | |
| 471.3156155 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.4s 3S | मोजलेले | NIST | |
| 471.3375684 nm | 4 | He I | emission | 1s.2p 3P* → 1s.4s 3S | मोजलेले | NIST | |
| 491.074748 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.4p 1P* | मोजलेले | NIST | |
| 492.0612726 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.4f 1F* | मोजलेले | NIST | |
| 492.1931036 nm | 20 | He I | emission | 1s.2p 1P* → 1s.4d 1D | मोजलेले | NIST | |
| 501.567801 nm | 100 | He I | emission | 1s.2s 1S → 1s.3p 1P* | मोजलेले | NIST | |
| 504.208749 nm | उपलब्ध नाही | He I | emission | 1s.2s 1S → 1s.3d 1D | मोजलेले | NIST | |
| 504.773857 nm | 10 | He I | emission | 1s.2p 1P* → 1s.4s 1S | मोजलेले | NIST | |
| 587.443388 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 1D | मोजलेले | NIST | |
| 587.446026 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 1D | मोजलेले | NIST | |
| 587.559871 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 587.561397 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 587.561484 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 587.56251 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 587.564036 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 587.596628 nm | 100 | He I | emission | 1s.2p 3P* → 1s.3d 3D | मोजलेले | NIST | |
| 655.976872 nm | उपलब्ध नाही | He II | emission | 4p 2P* → 6d 2D | मोजलेले | NIST | |
| 655.979395 nm | उपलब्ध नाही | He II | emission | 4s 2S → 6p 2P* | मोजलेले | NIST | |
| 655.98544 nm | उपलब्ध नाही | He II | emission | 4p 2P* → 6s 2S | मोजलेले | NIST | |
| 655.988733 nm | उपलब्ध नाही | He II | emission | 4s 2S → 6p 2P* | मोजलेले | NIST | |
| 656.005227 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6f 2F* | मोजलेले | NIST | |
| 656.005274 nm | उपलब्ध नाही | He II | emission | 4p 2P* → 6d 2D | मोजलेले | NIST | |
| 656.008318 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6p 2P* | मोजलेले | NIST | |
| 656.008387 nm | उपलब्ध नाही | He II | emission | 4p 2P* → 6d 2D | मोजलेले | NIST | |
| 656.01416 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6g 2G | मोजलेले | NIST | |
| 656.014176 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6f 2F* | मोजलेले | NIST | |
| 656.015708 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6d 2D | मोजलेले | NIST | |
| 656.015732 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6f 2F* | मोजलेले | NIST | |
| 656.016955 nm | उपलब्ध नाही | He II | emission | 4p 2P* → 6s 2S | मोजलेले | NIST | |
| 656.017657 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6p 2P* | मोजलेले | NIST | |
| 656.018478 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6g 2G | मोजलेले | NIST | |
| 656.01882 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6d 2D | मोजलेले | NIST | |
| 656.018823 nm | उपलब्ध नाही | He II | emission | 4d 2D → 6p 2P* | मोजलेले | NIST | |
| 656.019412 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6g 2G | मोजलेले | NIST | |
| 656.02096 nm | उपलब्ध नाही | He II | emission | 4f 2F* → 6d 2D | मोजलेले | NIST | |
| 663.190187 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.3p 1P* | मोजलेले | NIST | |
| 667.815174 nm | 100 | He I | emission | 1s.2p 1P* → 1s.3d 1D | मोजलेले | NIST | |
| 667.967687 nm | उपलब्ध नाही | He I | emission | 1s.2p 1P* → 1s.3d 3D | मोजलेले | NIST | |
| 706.517716 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3s 3S | मोजलेले | NIST | |
| 706.521532 nm | उपलब्ध नाही | He I | emission | 1s.2p 3P* → 1s.3s 3S | मोजलेले | NIST | |
| 706.570863 nm | 30 | He I | emission | 1s.2p 3P* → 1s.3s 3S | मोजलेले | NIST | |
| 716.055563 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.10p 3P* | मोजलेले | NIST | |
| 716.055907 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.10p 3P* | मोजलेले | NIST | |
| 716.055935 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.10p 3P* | मोजलेले | NIST | |
| 728.13508 nm | 50 | He I | emission | 1s.2p 1P* → 1s.3s 1S | मोजलेले | NIST | |
| 729.803204 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.9p 3P* | मोजलेले | NIST | |
| 729.803696 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.9p 3P* | मोजलेले | NIST | |
| 729.803736 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.9p 3P* | मोजलेले | NIST | |
| 749.984714 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.8p 3P* | मोजलेले | NIST | |
| 749.985457 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.8p 3P* | मोजलेले | NIST | |
| 749.985518 nm | उपलब्ध नाही | He I | emission | 1s.3s 3S → 1s.8p 3P* | मोजलेले | NIST |
विस्तारित गुणधर्म
सहसंयुजी त्रिज्या (विस्तारित)
- सहसंयुजी त्रिज्या (प्युक्को)
- 46 pm
व्हॅन डर वाल्स त्रिज्या
- Bondi
- 140 pm
- Alvarez
- 143 pm
- UFF
- 236.2 pm
- MM3
- 153 pm
अणुत्रिज्या आणि धात्विक त्रिज्या
- अणुत्रिज्या (राह्म)
- 134 pm
- धात्विक त्रिज्या (C12)
- 122 pm
क्रमांकन मापनपट्ट्या
- Mendeleev
- 112
- Pettifor
- 1
- Glawe
- 1
विद्युतऋणता मापनपट्ट्या
- Ghosh
- 0
- Gunnarsson–Lundqvist
- 8
- Robles–Bartolotti
- 8
ध्रुवणक्षमता आणि अपस्करण
- द्विध्रुव ध्रुवणक्षमता
- 1.3838 a.u.
- द्विध्रुव ध्रुवणक्षमता (अनिश्चितता)
- 0 a.u.
- C₆
- 1.42 Ha·Bohr6
- C₆ (Gould–Bučko)
- 1.47 Ha·Bohr6
रासायनिक आसक्ती
- प्रोटॉन आसक्ती
- 177.8 kJ/mol
- वायूची क्षारकता
- 148.5 kJ/mol
पुरवठा जोखीम आणि अर्थकारण
- उत्पादनाचे केंद्रीकरण
- 22
- सापेक्ष पुरवठा जोखीम
- 7
- साठ्यांचे वितरण
- 21
- राजकीय स्थैर्य (प्रमुख उत्पादक)
- 57
- राजकीय स्थैर्य (सर्वाधिक साठे असलेला देश)
- 57
राजवायूंचे गुणधर्म
अवस्थांतरे आणि अपरूपे
| उत्कलनांक | 4.22 K |
| क्रांतिक बिंदू (तापमान) | 5.19 K |
| क्रांतिक बिंदू (दाब) | 0.23 MPa |
| त्रिक बिंदू (तापमान) | 2.18 K |
| त्रिक बिंदू (दाब) | 5.04 kPa |
प्रगत संदर्भ माहिती
परिरक्षण स्थिरांक (1)
| n | कक्षिका | σ |
|---|---|---|
| 1 | s | 0.3125 |
समस्थानिक क्षय प्रकार (9)
| समस्थानिक | मोड | तीव्रता |
|---|---|---|
| 5 | n | 100% |
| 6 | B- | 100% |
| 6 | B-d | 0% |
| 7 | n | 100% |
| 8 | B- | 100% |
| 8 | B-n | 16% |
| 8 | B-t | 0.9% |
| 9 | n | 100% |
| 10 | 2n | 100% |
क्ष-किरण प्रकीर्णन गुणक (501)
| ऊर्जा (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 0 |
| 10.1617 | — | 0 |
| 10.3261 | — | 0 |
| 10.4931 | — | 0 |
| 10.6628 | — | 0 |
| 10.8353 | — | 0 |
| 11.0106 | — | 0 |
| 11.1886 | — | 0 |
| 11.3696 | — | 0 |
| 11.5535 | — | 0 |
अतिरिक्त माहिती
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
8×10-3 milligrams per kilogram
संदर्भ (1)
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
7×10-6 milligrams per liter
संदर्भ (1)
Sources
Sources of this element.
Except for hydrogen, helium is the most abundant element found in the universe. Helium is extracted from natural gas. In fact, all natural gas contains at least trace quantities of helium.
It has been detected spectroscopically in great abundance, especially in the hotter stars, and it is an important component in both the proton-proton reaction and the carbon cycle, which account for the energy of the sun and stars.
The helium content of the atmosphere is about 1 part in 200,000. While it is present in various radioactive minerals as a decay product, the bulk of the Free World's supply is obtained from wells in Texas, Oklahoma, and Kansas. Outside the United States, the only known helium extraction plants, in 1984 were in Eastern Europe (Poland), the USSR, and a few in India.
संदर्भ (1)
- [6] Helium https://periodic.lanl.gov/2.shtml
संदर्भ
(9)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of 17 national laboratories funded by the U.S. Department of Energy. The lab's primary mission is to conduct basic research of the atom's nucleus using the lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF). For more information visit https://www.jlab.org/
The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
The periodic table contains NIST's critically-evaluated data on atomic properties of the elements. The provenance data that include data for atomic spectroscopy, X-ray and gamma ray, radiation dosimetry, nuclear physics, and condensed matter physics may be found from the link under the source name. Ref: https://www.nist.gov/pml/atomic-spectra-database
This section provides all form of data related to element Helium.
The element property data was retrieved from publications.