Potassium (K)
alkali-metalSolid
표준 원자량
39.0983 u전자 배치
[Ar] 4s1녹는점
63.38 °C끓는점
758.85 °C밀도
890 kg/m³산화 상태
−1, +1전기 음성도(Pauling)
0.82제1 이온화 에너지
4.340664 eV발견 연도
1807원자 반지름
220 pm상세 정보
Potassium is an alkali metal and a major rock-forming and biological element. It occurs naturally only in compounds, chiefly as K⁺ in salts, feldspars, micas, and clay minerals. The metal is highly electropositive, reacts vigorously with water, and is stored away from air and moisture. In living cells, potassium is the principal intracellular cation and is central to osmotic balance and electrical signaling.
It is one of the most reactive and electropositive of metals. Except for lithium, it is the lightest known metal. It is soft, easily cut with a knife, and is silvery in appearance immediately after a fresh surface is exposed. It rapidly oxidizes in air and must be preserved in a mineral oil such as kerosene.
As with other metals of the alkali group, it decomposes in water with the evolution of hydrogen. It catches fire spontaneously on water. Potassium and its salts impart a violet color to flames.
The name derives from the English "potash" or "pot ashes" because it is found in caustic potash (KOH). The symbol K derives from the Latin kalium via the Arabic qali for alkali. It was first isolated by the British chemist Humphry Davy in 1807 from electrolysis of potash (KOH).
Although potassium is the eighth most abundant element on earth and comprises about 2.1% of the earth's crust, it is a very reactive element and is never found free in nature. Metallic potassium was first isolated by Sir Humphry Davy in 1807 through the electrolysis of molten caustic potash (KOH). A few months after discovering potassium, Davy used the same method to isolate sodium. Potassium can be obtained from the minerals sylvite (KCl), carnallite (KCl·MgCl2·6H2O), langbeinite (K2Mg2(SO4)3) and polyhalite (K2Ca2Mg(SO4)4·2H2O). These minerals are often found in ancient lake and sea beds. Caustic potash, another important source of potassium, is primarily mined in Germany, New Mexico, California and Utah. Pure potassium is a soft, waxy metal that can be easily cut with a knife. It reacts with oxygen to form potassium superoxide (KO2) and with water to form potassium hydroxide (KOH), hydrogen gas and heat. Enough heat is produced to ignite the hydrogen gas. To prevent it from reacting with the oxygen and water in the air, samples of metallic potassium are usually stored submerged in mineral oil.
From the English word, potash - pot ashes; Latin kalium, Arab qali, alkali. Discovered in 1807 by Davy, who obtained it from caustic potash (KOH); this was the first metal isolated by electrolysis.
Pure potassium is a very soft, silvery metal when freshly cut. It tarnishes rapidly in air as oxide, hydroxide, and carbonate layers form. It has a low melting point for a metal and can be cut with a knife; samples are commonly kept under dry mineral oil or inert gas.
Elemental potassium has limited direct use because sodium is cheaper and less reactive for many purposes. It is used in some laboratory reductions and in potassium-sodium alloys for heat-transfer applications where a liquid metal is useful. Most practical demand is for potassium compounds, especially fertilizers that supply plant-available K⁺. Potassium salts are also used in glass, soaps, pyrotechnics, food processing, and chemical manufacturing.
Potassium forms an alloy with sodium (NaK) that is used as a heat transfer medium in some types of nuclear reactors.
Potassium forms many important compounds. Potassium chloride (KCl) is the most common potassium compound. It is used in fertilizers, as a salt substitute and to produce other chemicals. Potassium hydroxide (KOH) is used to make soaps, detergents and drain cleaners. Potassium carbonate (KHCO3), also known as pearl ash, is used to make some types of glass and soaps and is obtained commercially as a byproduct of the production of ammonia. Potassium superoxide (KO2) can create oxygen from water vapor (H2O) and carbon dioxide (CO2) through the following reaction: 2KO2 + H2O + 2CO2 => 2KHCO3 + O2. It is used in respiratory equipment and is produced by burning potassium metal in dry air. Potassium nitrate (KNO3), also known as saltpeter or nitre, is used in fertilizers, match heads and pyrotechnics.
The greatest demand for potash has been in its use for fertilizers. Potassium is an essential constituent for plant growth and is found in most soils.
An alloy of sodium and potassium (NaK) is used as a heat-transfer medium. Many potassium salts are of utmost importance, including the hydroxide, nitrate, carbonate, chloride, chlorate, bromide, iodide, cyanide, sulfate, chromate, and dichromate.
Isotopes in Biology
The mole fraction of 40K, n(40K)/n(K), is used to study the effects of potassium in soil on the growth of plants. Plants need potassium to promote growth and reproduction, and potassium also helps plants resist drought and diseases. The mole fraction of 40K is being studied at different depths in several soil types to determine how soil properties affect the fractionation of 40K [178] R. Fujiyoshi, Y. Satake, T. Sumiyoshi. J. Radioanal. Nucl. Chem.281, 553 (2009)..
Isotopes in Geochronology
The amount ratio n(40K)/n(40Ar) is used in potassium-argon dating by geologists, archaeologists, and paleoanthropologists to determine the age of rocks. This dating method is based on the radioactive decay of 40K, having a half-life of 1.248×109 years, to 40Ar. When lava crystalizes, 40Ar can no longer escape and begins increasing in concentration in a rock (Fig. IUPAC.19.1) [179] United States Geological Survey. Geology and Geophysics, U.S. Geological Survey (2014), Feb. 25; http://geomaps.wr.usgs.gov/common/geochronology.html., [180] New Mexico Bureau of Geology & Mineral Resources. K/Ar and 40Ar/39Ar Methods, New Mexico Bureau of Geology & Mineral Resources (2014), Feb. 25; http://geoinfo.nmt.edu/labs/argon/methods/home.html..
Isotopes in Medicine
38K, which has a half-life of 7.6 min and is produced by a nuclear reaction involving 38Ar and 40Ar as targets, is a widely used blood-flow tracer. Because 38Ar is more expensive, 40Ar, which also offers many additional advantages as a target, is more commonly used to produce 38K for medical purposes [75] J. Peterson, M. McDonell, L. Haroun, F. Monette, R. D. Hildebrand, A. Taboas. Radiological and Chemical Fact Sheets to Support Health Risk Analyses for Contaminated Areas, Prepared by Argonne National Laboratory Environmental Science Division in collaboration with U.S. Department of Energy, Richland Operations Office and Chicago Operations Office (2014), Feb. 22; http://www.remm.nlm.gov/ANL_ContaminantFactSheets_All_070418.pdf., [176] K. Nagatsu, A. Kubodera, K. Suzuki. Appl. Radiat. Isot.49, 1505 (1998)., [181] P. G. Melon, C. Brihaye, C. Degueldre, M. Guillaume, R. Czichosz, P. Rigo, H. E. Kulbertus, D. Comar. J. Nucl. Med.35, 1116 (1994)..
Potassium chemistry is dominated by the +1 oxidation state and the K⁺ ion. Common compounds include potassium chloride (KCl), the main fertilizer potash salt; potassium hydroxide (KOH), a strong base used in alkaline chemistry; potassium carbonate (K₂CO₃); potassium nitrate (KNO₃), an oxidizing salt; and potassium permanganate (KMnO₄), in which potassium is only the counterion to permanganate. Potassium forms ionic halides, oxides, superoxide potassium superoxide (KO₂), and many double salts and aluminosilicates.
See more information at the Potassium compound page.
Metallic potassium is a severe fire and chemical hazard. It reacts with water to form potassium hydroxide (KOH) and hydrogen (H₂), often with enough heat to ignite the gas. Concentrated potassium hydroxide is strongly corrosive. Soluble potassium salts vary widely in hazard; ordinary dietary amounts are essential, but excessive intake or medical exposure can disturb heart rhythm. Natural potassium contains radioactive ⁴⁰K at low abundance.
Potassium is abundant in the crust and is released slowly by weathering of silicate minerals, then cycled through soils, waters, plants, and organisms as K⁺. It is not degraded, but it is redistributed by erosion, leaching, uptake, and ion exchange on clays. Potassium is an essential plant nutrient, and deficiency limits crop growth in many soils. The isotope ⁴⁰K is a natural source of background radiation.
The potassium economy is centered on potash minerals and brines rather than the free metal. Commercial products are mined or solution-mined from evaporite deposits and processed mainly into potassium chloride (KCl), with potassium sulfate (K₂SO₄) important for chloride-sensitive crops. Demand is strongly linked to agriculture, so fertilizer logistics and ore quality dominate supply. Elemental potassium is made by chemical reduction or electrochemical routes on a much smaller scale and is not a bulk commodity comparable with sodium.
The metal is the seventh most abundant and makes up about 2.4% by weight of the earth's crust. Most potassium minerals are insoluble and the metal is obtained from them only with great difficulty.
Certain minerals, however, such as sylvite, carnallite, langbeinite, and polyhalite are found in ancient lake and sea beds and form rather extensive deposits from which potassium and its salts can readily be obtained. Potash is mined in Germany, New Mexico, California, Utah, and elsewhere. Large deposits of potash, found at a depth of some 3000 ft in Saskatchewan, promise to be important in coming years.
Potassium is also found in the ocean, but is present only in relatively small amounts, compared to sodium.
Potassium is produced in stellar nucleosynthesis and supernova-related processes but is far less abundant cosmically than lighter elements such as sodium, magnesium, and silicon. In rocky planets it behaves as a moderately incompatible lithophile element, concentrating in crustal rocks and evolved magmas. Radioactive ⁴⁰K contributed heat to early planetary interiors and remains important in geochronology.
- The chemical symbol K comes from kalium, a Neo-Latin name derived from alkali sources.
- Potassium metal is less dense than water, although contact with water is violently reactive.
- Potassium chloride can be purple or reddish as a mineral because of impurities or radiation-induced color centers.
- Potassium-argon dating depends on the decay of ⁴⁰K to ⁴⁰Ar trapped in minerals.
- Potassium superoxide (KO₂) has been used in breathing equipment because it reacts with CO₂ and moisture to release O₂.
이미지
특성
물리적 특성
- 원자 반지름(경험값)
- 220 pm 모든 원소의 원자 반지름(경험값) 비교 →
- 공유 결합 반지름
- 203 pm 모든 원소의 공유 결합 반지름 비교 →
- 반데르발스 반지름
- 275 pm 모든 원소의 반데르발스 반지름 비교 →
- 금속 반지름
- 203 pm 모든 원소의 금속 반지름 비교 →
- 밀도
- 890 kg/m³ 모든 원소의 밀도 비교 →
- 몰 부피
- 0.0453 L/mol
- STP에서의 상
- 고체 모든 원소의 STP에서의 상 비교 →
- 녹는점
- 63.38 °C 모든 원소의 녹는점 비교 →
- 끓는점
- 758.85 °C 모든 원소의 끓는점 비교 →
- 열전도율
- 79 W/(m·K) 모든 원소의 열전도율 비교 →
- 비열
- 0.757 J/(g·K) 모든 원소의 비열 비교 →
- 몰 열용량
- 29.6 J/(mol·K) 모든 원소의 몰 열용량 비교 →
- 결정 구조
- 체심 입방 모든 원소의 결정 구조 비교 →
화학적 특성
- 전기 음성도(Pauling)
- 0.82 모든 원소의 전기 음성도(Pauling) 비교 →
- 전기 음성도(Allen)
- 0.734
- 전자 친화도
- 0.5014 eV
- 제1 이온화 에너지
- 4.340664 eV 모든 원소의 제1 이온화 에너지 비교 →
- 제2 이온화 에너지
- 31.625109 eV 모든 원소의 제2 이온화 에너지 비교 →
- 제3 이온화 에너지
- 45.803258 eV 모든 원소의 제3 이온화 에너지 비교 →
- 제4 이온화 에너지
- 60.91721 eV 모든 원소의 제4 이온화 에너지 비교 →
- 제5 이온화 에너지
- 82.660285 eV 모든 원소의 제5 이온화 에너지 비교 →
- 산화 상태
- −1, +1 모든 원소의 산화 상태 비교 →
- 원자가 전자
- 1 모든 원소의 원자가 전자 비교 →
- 전자 배치
- [Ar] 4s1
열역학적 특성
- 임계점(온도)
- 1950 °C
- 임계점(압력)
- 1.6e+7 Pa
- 융해열
- 0.02414883 eV 모든 원소의 융해열 비교 →
- 기화열
- 0.79701508 eV 모든 원소의 기화열 비교 →
- 승화열
- 0.92449604 eV
- 원자화열
- 0.92449604 eV
- 원자화 엔탈피
- 0.92242317 eV
핵 특성
- 양성자 수
- 19 모든 원소의 양성자 수 비교 →
- 중성자 수
- 20 모든 원소의 중성자 수 비교 →
- 알려진 동위원소 수
- 29 모든 원소의 알려진 동위원소 수 비교 →
- 안정 동위원소 수
- 2 모든 원소의 안정 동위원소 수 비교 →
- 가장 안정한 동위원소
- K-39
- 발견 연도
- 1807
존재비
- 존재비(지각)
- 2.09e+4 mg/kg 모든 원소의 존재비(지각) 비교 →
- 존재비(해양)
- 399 mg/L 모든 원소의 존재비(해양) 비교 →
결정 구조
- 격자 상수 a
- 523 pm
전자 구조
- 전자껍질별 전자 수
- 2, 8, 8, 1 모든 원소의 전자껍질별 전자 수 비교 →
식별자
- CAS 등록 번호
- 7440-09-7 모든 원소의 CAS 등록 번호 비교 →
- 항 기호
- 2S1/2
- InChI
- InChI=1S/K
- InChI 키
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N
전자 배치 측정값
K: 4s¹[Ar] 4s¹1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹원자 모형
동위원소에 따라 중성자 수, 질량, 안정성은 달라지지만, 중성 원자의 전자 배치는 달라지지 않습니다.
개략적인 원자 모형이며 실제 비율과 다릅니다.
원자 지문
방출 / 흡수 스펙트럼
동위원소 분포
| 질량수 | 원자 질량(u) | 천연 존재비 | 반감기 |
|---|---|---|---|
| 39 안정 | 38.9637064864 ± 0.0000000049 | 93.2581% | 안정 |
| 41 안정 | 40.9618252579 ± 0.0000000041 | 6.7302% | 안정 |
상 / 상태
이유: 녹는점(63.38 °C)보다 38.4 °C 낮음
개략도이며 실제 비율과 다름
상전이점
전이 에너지
녹는점에서 1 mol을 녹이는 데 필요한 에너지
끓는점에서 1 mol을 기화시키는 데 필요한 에너지
승화점에서 1 mol을 승화시키는 데 필요한 에너지
밀도
표준 조건에서
표준 조건에서
심화
원자 스펙트럼
전체 22개 중 10개를 표시합니다. 이온 전하순으로 정렬되었습니다(오름차순).
보유 에너지 준위 데이터 ?
| 이온 | 전하 | 준위 |
|---|---|---|
| 41K I 동위원소 | 0 | 8 |
| 40K I 동위원소 | 0 | 3 |
| 39K I 동위원소 | 0 | 123 |
| K I | 0 | 299 |
| K II | +1 | 97 |
| K III | +2 | 40 |
| K IV | +3 | 38 |
| K V | +4 | 40 |
| K VI | +5 | 28 |
| K VII | +6 | 81 |
이온 반지름
| 전하 | 배위 | 스핀 | 반지름 |
|---|---|---|---|
| +1 | 4 | 해당 없음 | 137 pm |
| +1 | 6 | 해당 없음 | 138 pm |
| +1 | 7 | 해당 없음 | 146 pm |
| +1 | 8 | 해당 없음 | 151 pm |
| +1 | 9 | 해당 없음 | 155 pm |
| +1 | 10 | 해당 없음 | 159 pm |
| +1 | 12 | 해당 없음 | 164 pm |
화합물
동위원소 (2)
Seventeen isotopes of potassium are known. Ordinary potassium is composed of three isotopes, one of which is 40°K (0.0118%), a radioactive isotope with a half-life of 1.28 x 109 years.
| 질량수 | 원자 질량(u) | 천연 존재비 | 반감기 | 붕괴 방식 | |
|---|---|---|---|---|---|
| 39 안정 | 38.9637064864 ± 0.0000000049 | 93.2581% ± 0.0044% | 안정 | stable | |
| 41 안정 | 40.9618252579 ± 0.0000000041 | 6.7302% ± 0.0044% | 안정 | stable |
스펙트럼선
전체 141개 중 50개를 표시합니다. 기본적으로 세기가 측정된 스펙트럼선만 표시됩니다.
| 파장(nm) | 세기 | 이온화 단계 | 유형 | 전이 | 정확도 | 출처 | |
|---|---|---|---|---|---|---|---|
| 693.8764 nm | 20 | K I | emission | 3p6.4p 2P* → 3p6.6s 2S | 측정값 | NIST | |
| 691.10815 nm | 19 | K I | emission | 3p6.4p 2P* → 3p6.6s 2S | 측정값 | NIST | |
| 404.41422 nm | 18 | K I | emission | 3p6.4s 2S → 3p6.5p 2P* | 측정값 | NIST | |
| 404.72132 nm | 17 | K I | emission | 3p6.4s 2S → 3p6.5p 2P* | 측정값 | NIST | |
| 580.17662 nm | 17 | K I | emission | 3p6.4p 2P* → 3p6.7s 2S | 측정값 | NIST | |
| 583.18899 nm | 17 | K I | emission | 3p6.4p 2P* → 3p6.5d 2D | 측정값 | NIST | |
| 578.23999 nm | 16 | K I | emission | 3p6.4p 2P* → 3p6.7s 2S | 측정값 | NIST | |
| 581.21521 nm | 15 | K I | emission | 3p6.4p 2P* → 3p6.5d 2D | 측정값 | NIST | |
| 535.95761 nm | 14 | K I | emission | 3p6.4p 2P* → 3p6.6d 2D | 측정값 | NIST | |
| 533.96873 nm | 13 | K I | emission | 3p6.4p 2P* → 3p6.8s 2S | 측정값 | NIST | |
| 511.225448 nm | 12 | K I | emission | 3p6.4p 2P* → 3p6.7d 2D | 측정값 | NIST | |
| 532.32786 nm | 12 | K I | emission | 3p6.4p 2P* → 3p6.8s 2S | 측정값 | NIST | |
| 534.29693 nm | 12 | K I | emission | 3p6.4p 2P* → 3p6.6d 2D | 측정값 | NIST | |
| 693.62861 nm | 12 | K I | emission | 3p6.4p 2P* → 3p6.4d 2D | 측정값 | NIST | |
| 696.46903 nm | 12 | K I | emission | 3p6.4p 2P* → 3p6.4d 2D | 측정값 | NIST | |
| 464.23725 nm | 11 | K I | emission | 3p6.4s 2S → 3p6.3d 2D | 측정값 | NIST | |
| 509.717137 nm | 11 | K I | emission | 3p6.4p 2P* → 3p6.7d 2D | 측정값 | NIST | |
| 509.920005 nm | 11 | K I | emission | 3p6.4p 2P* → 3p6.9s 2S | 측정값 | NIST | |
| 464.1875 nm | 10 | K I | emission | 3p6.4s 2S → 3p6.3d 2D | 측정값 | NIST | |
| 496.503213 nm | 10 | K I | emission | 3p6.4p 2P* → 3p6.8d 2D | 측정값 | NIST | |
| 508.423399 nm | 10 | K I | emission | 3p6.4p 2P* → 3p6.9s 2S | 측정값 | NIST | |
| 482.924 nm | 9 | K II | emission | 3p5.4s 3P* → 3p5.4p 3S | 측정값 | NIST | |
| 486.975897 nm | 9 | K I | emission | 3p6.4p 2P* → 3p6.9d 2D | 측정값 | NIST | |
| 495.081801 nm | 9 | K I | emission | 3p6.4p 2P* → 3p6.8d 2D | 측정값 | NIST | |
| 495.614802 nm | 9 | K I | emission | 3p6.4p 2P* → 3p6.10s 2S | 측정값 | NIST | |
| 389.7896 nm | 8 | K II | emission | 3p5.4s 3P* → 3p5.4p 1D | 측정값 | NIST | |
| 418.6232 nm | 8 | K II | emission | 3p5.4s 3P* → 3p5.4p 3D | 측정값 | NIST | |
| 460.849 nm | 8 | K II | emission | 3p5.4s 1P* → 3p5.4p 1D | 측정값 | NIST | |
| 480.43395 nm | 8 | K I | emission | 3p6.4p 2P* → 3p6.10d 2D | 측정값 | NIST | |
| 485.609209 nm | 8 | K I | emission | 3p6.4p 2P* → 3p6.9d 2D | 측정값 | NIST | |
| 486.348075 nm | 8 | K I | emission | 3p6.4p 2P* → 3p6.11s 2S | 측정값 | NIST | |
| 500.564 nm | 8 | K II | emission | 3p5.4s 3P* → 3p5.4p 3S | 측정값 | NIST | |
| 612.028 nm | 8 | K II | emission | 3p5.3d 3F* → 3p5.4p 3D | 측정값 | NIST | |
| 381.7547 nm | 7 | K II | emission | 3p5.4p 3D → 3p5.(2P*<3/2>).5s 2[3/2]* | 측정값 | NIST | |
| 400.122 nm | 7 | K II | emission | 3p5.4s 3P* → 3p5.4p 3P | 측정값 | NIST | |
| 413.4705 nm | 7 | K II | emission | 3p5.4s 3P* → 3p5.4p 3D | 측정값 | NIST | |
| 422.296 nm | 7 | K II | emission | 3p5.4s 1P* → 3p5.4p 3P | 측정값 | NIST | |
| 422.566 nm | 7 | K II | emission | 3p5.3d 3P* → 3p5.4p 1D | 측정값 | NIST | |
| 426.334 nm | 7 | K II | emission | 3p5.4s 3P* → 3p5.4p 3D | 측정값 | NIST | |
| 430.498 nm | 7 | K II | emission | 3p5.3d 3P* → 3p5.4p 1D | 측정값 | NIST | |
| 430.911 nm | 7 | K II | emission | 3p5.4s 1P* → 3p5.4p 3P | 측정값 | NIST | |
| 438.816 nm | 7 | K II | emission | 3p5.4s 1P* → 3p5.4p 1P | 측정값 | NIST | |
| 475.737719 nm | 7 | K I | emission | 3p6.4p 2P* → 3p6.11d 2D | 측정값 | NIST | |
| 479.104132 nm | 7 | K I | emission | 3p6.4p 2P* → 3p6.10d 2D | 측정값 | NIST | |
| 484.98645 nm | 7 | K I | emission | 3p6.4p 2P* → 3p6.11s 2S | 측정값 | NIST | |
| 505.625 nm | 7 | K II | emission | 3p5.3d 3P* → 3p5.4p 3S | 측정값 | NIST | |
| 630.728 nm | 7 | K II | emission | 3p5.3d 3F* → 3p5.4p 3D | 측정값 | NIST | |
| 696.41712 nm | 7 | K I | emission | 3p6.4p 2P* → 3p6.4d 2D | 측정값 | NIST | |
| 380.0162 nm | 6 | K II | emission | 3p5.4p 3D → 3p5.(2P*<3/2>).5s 2[3/2]* | 측정값 | NIST | |
| 381.657 nm | 6 | K II | emission | 3p5.4p 3P → 3p5.4d 3P* | 측정값 | NIST |
확장 특성
공유 결합 반지름(확장)
- 공유 결합 반지름(Pyykkö)
- 196 pm
- 공유 결합 반지름(Pyykkö, 이중 결합)
- 193 pm
- 공유 결합 반지름(Bragg)
- 207 pm
반데르발스 반지름
- Bondi
- 275 pm
- Batsanov
- 280 pm
- Alvarez
- 273 pm
- UFF
- 381.2 pm
- MM3
- 309 pm
원자 및 금속 반지름
- 원자 반지름(Rahm)
- 234 pm
- 금속 반지름(C12)
- 235 pm
번호 척도
- Mendeleev
- 3
- Pettifor
- 10
- Glawe
- 10
전기 음성도 척도
- Ghosh
- 0
- Miedema
- 2
- Gunnarsson–Lundqvist
- 2
- Robles–Bartolotti
- 1
분극률 및 분산
- 쌍극자 분극률
- 289.7 a.u.
- 쌍극자 분극률(불확도)
- 0.3 a.u.
- C₆
- 3923 Ha·Bohr6
- C₆ (Gould–Bučko)
- 3910 Ha·Bohr6
미데마 매개변수
- 미데마 몰 부피
- 45.63 cm3/mol
- 미데마 전자 밀도
- 0
공급 위험 및 경제성
- 생산 집중도
- 21
- 상대적 공급 위험
- 5
- 매장량 분포
- 61
- 정치적 안정성(최대 생산국)
- 81
- 정치적 안정성(최대 매장국)
- 81
상전이 및 동소체
| 녹는점 | 336.65 K |
| 끓는점 | 1032.15 K |
| 임계점(온도) | 2223.15 K |
| 임계점(압력) | 16 MPa |
산화 상태 분류
심화 참고 데이터
차폐 상수 (6)
| n | 오비탈 | σ |
|---|---|---|
| 1 | s | 0.5105 |
| 2 | p | 3.9728 |
| 2 | s | 5.9938 |
| 3 | p | 11.2744 |
| 3 | s | 10.3201 |
| 4 | s | 15.5048 |
결정 반지름 상세 정보 (7)
| 전하 | CN | 스핀 | rcrystal (pm) | 기원 |
|---|---|---|---|---|
| 1 | IV | 151 | ||
| 1 | VI | 152 | ||
| 1 | VII | 160 | ||
| 1 | VIII | 165 | ||
| 1 | IX | 169 | ||
| 1 | X | 173 | ||
| 1 | XII | 178 |
동위원소 붕괴 방식 (53)
| 동위원소 | 모드 | 세기 |
|---|---|---|
| 31 | 3p | 100% |
| 32 | p | — |
| 33 | p | — |
| 34 | p | — |
| 35 | B+ | 100% |
| 35 | B+p | 0.4% |
| 36 | B+ | 100% |
| 36 | B+p | 0% |
| 36 | B+A | 0% |
| 37 | B+ | 100% |
X선 산란 인자 (503)
| 에너지 (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 0.03426 |
| 10.1617 | — | 0.03529 |
| 10.3261 | — | 0.03635 |
| 10.4931 | — | 0.03744 |
| 10.6628 | — | 0.03856 |
| 10.8353 | — | 0.03972 |
| 11.0106 | — | 0.04091 |
| 11.1886 | — | 0.04214 |
| 11.3696 | — | 0.0434 |
| 11.5535 | — | 0.04471 |
추가 데이터
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
2.09×104 milligrams per kilogram
참고 문헌 (1)
- [5] Potassium https://education.jlab.org/itselemental/ele019.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
3.99×102 milligrams per liter
참고 문헌 (1)
- [5] Potassium https://education.jlab.org/itselemental/ele019.html
Sources
Sources of this element.
The metal is the seventh most abundant and makes up about 2.4% by weight of the earth's crust. Most potassium minerals are insoluble and the metal is obtained from them only with great difficulty.
Certain minerals, however, such as sylvite, carnallite, langbeinite, and polyhalite are found in ancient lake and sea beds and form rather extensive deposits from which potassium and its salts can readily be obtained. Potash is mined in Germany, New Mexico, California, Utah, and elsewhere. Large deposits of potash, found at a depth of some 3000 ft in Saskatchewan, promise to be important in coming years.
Potassium is also found in the ocean, but is present only in relatively small amounts, compared to sodium.
참고 문헌 (1)
- [6] Potassium https://periodic.lanl.gov/19.shtml
Production
Production of this element (from raw materials or other compounds containing the element).
Potassium is never found free in nature, but is obtained by electrolysis of the hydroxide, much in the same manner as prepared by Davy's first process. Thermal methods also are commonly used to produce potassium (such as by reduction of potassium compounds with CaC2, C, Si, or Na).
참고 문헌 (1)
- [6] Potassium https://periodic.lanl.gov/19.shtml
참고 문헌
(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 Potassium.
The element property data was retrieved from publications.