Actinium (Ac)
actinideSolid
Masse atomique relative standard
[227]Configuration électronique
[Rn] 7s2 6d1Point de fusion
1050,85 °CPoint d’ébullition
3197,85 °CMasse volumique
1,007e+4 kg/m³États d’oxydation
+3Électronégativité (Pauling)
1,1Énergie d’ionisation (1re)
5,380235 eVAnnée de découverte
1899Rayon atomique
195 pmDétails
Actinium is a radioactive actinide metal and the element that gives the actinide series its name. Natural actinium is present only in minute amounts, chiefly as ²²⁷Ac in uranium decay chains. Its chemistry is dominated by the +3 oxidation state and resembles that of lanthanum more than the later, more strongly 5f-influenced actinides. Because all isotopes are radioactive and scarce, most knowledge comes from tracer-scale chemistry rather than ordinary bulk handling.
Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. In equilibrium with its decay products, it is a powerful source of alpha particles. Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300-degrees C. The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum. Purified actinium comes into equilibrium with its decay products at the end of 185 days, and then decays according to its 21.6-year half-life. It is about 150 times as active as radium, making it of value in the production of neutrons.
In April of 2012, Los Alamos National Laboratory announced a new medical isotope project that shows promise for rapidly producing major quantities of a new cancer-treatment agent, actinium 225 (Ac-225). Both a press release and a video are available.
Actinium was discovered in 1899 by André-Louis Debierne, a French chemist, while experimenting with new methods of separating rare earth oxides. Friedrich Otto Giesel independently discovered actinium in 1902. Actinium is a rare element that is present in uranium ores in tiny amounts, but it is usually cheaper and easier to create actinium when it is needed by bombarding radium with neutrons in a nuclear reactor.
Actinium's most stable isotope, actinium-227, has a half-life of 21.77 years. It decays into francium-223 through alpha decay or into thorium-227 through beta decay.
From the Greek aktis, aktinos, meaning beam or ray. Discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902. Occurs naturally in association with uranium minerals.
A freshly prepared macroscopic sample has rarely been available. Metallic actinium is described as silvery, but its bulk appearance and many physical properties are not as well characterized as those of common metals. It is expected to tarnish rapidly in air and to be self-luminous in the dark from intense radioactivity exciting surrounding materials.
Actinium has no broad commercial use as an elemental material. ²²⁵Ac is important in research and limited clinical development for targeted alpha therapy, where it is attached to carrier molecules intended to deliver alpha-emitting decay products to diseased cells. ²²⁷Ac has been used as a source for generating ²²⁷Th and other decay-chain nuclides, and actinium isotopes are used in radiochemical research, detector calibration, and studies of actinide separation chemistry. Proposed neutron-source uses with light-element targets are historically noted but are not a major present application.
Actinium has no significant commercial applications, although it is used in the production of neutrons.
Isotopes in Earth/Planetary Science
227Ac (with a half-life of 21.77 years) has been used as a tracer of deep-sea mixing in the oceans. By determining concentrations of 227Ac in a water column, scientists can study the rates and patterns of mixing and other vertical exchange processes [583] W. Geibert, M. M. Rutgers van der Loeff, C. Hanfland, H. J. Dauelsberg. Earth. Planet. Sci. Lett.198, 147 (2002).. As a product of the 235U decay chain, 227Ac and other radioisotopes have been used to determine information about the movement of fluids in mid-oceanic ridges and basaltic melts [584] D. McKenzie. Chem. Geol.162, 81 (2000)., [585] W. S. Moore, W. Ussler III, C. K. Paull. Mar. Chem.109, 421 (2008)..
Isotopes in Medicine
225Ac (with a half-life of 10 days) can be used in cancer treatments (Fig. IUPAC.89.1). The isotope is attached to a chelating agent (a substance that can form multiple bonds to a single metal ion) and delivered to the problem site. The emissions of alpha particles from actinium and its daughter products cause tumor death [586] M. R. McDevitt, D. Ma, L. T. Lai, J. Simon, P. Borchardt, R. K. Frank, K. Wu, V. Pellegrini, M. J. Curcio, M. Miederer, N. H. Bander, D. A. Scheinberg. Science294, 1537 (2001).. 225Ac in a series of alpha decays produces 213Bi (with a half-life of 0.76 h), which is also used for radioimmunotherapy [587] D. Ma, M. R. McDevitt, R. D. Finn, D. A. Scheinberg. Appl. Radiat. Isot.55, 667 (2001)..
Isotopes Used as a Source of Radioactive Isotope(s)
225Ac, which is a pure alpha emitter, is used to produce 213Bi with an 225Ac/ 213Bi radionuclide generator (Fig. IUPAC.89.2). 213Bi is a mixed alpha and beta emitter. The primary mode of decay is by beta emission to the very short-lived, alpha emitter 213Po. The 8.4 MeV alpha particle emitted by 213Po has a path length of 76 μm in human tissue and is responsible for its cytotoxic effects.
Actinium chemistry is almost entirely trivalent, with Ac³⁺ forming colorless or pale salts in the absence of colored counterions. Representative compounds include actinium oxide, Ac₂O₃, actinium fluoride, AcF₃, actinium chloride, AcCl₃, and actinium hydroxide, Ac(OH)₃. The ion is large and hard, so it favors oxygen- and fluorine-donor ligands and forms sparingly soluble fluorides, phosphates, oxalates, and hydroxides. Higher oxidation states are not established for ordinary actinium chemistry.
See more information at the Actinium compound page.
All actinium isotopes are radioactive, and safety depends strongly on isotope, activity, chemical form, and route of exposure. ²²⁷Ac is long-lived enough to persist and produces a chain of radioactive daughters, while ²²⁵Ac is a potent alpha emitter used only under controlled radiochemical conditions. Internal uptake is the principal concern because alpha particles cause severe local ionization in tissue. External gamma radiation from daughter products can also require shielding and remote handling.
Natural actinium occurs at trace levels in uranium-bearing minerals as part of decay chains and is continuously formed and lost by radioactive decay. In the environment Ac³⁺ is expected to bind strongly to mineral surfaces, organic matter, and phosphate- or carbonate-containing solids, limiting mobility under many conditions. It has no known biological role. Releases outside specialized nuclear or radiochemical settings are uncommon, and environmental behavior is inferred largely from tracer studies and analog chemistry.
Actinium is not traded as a bulk commodity. Usable quantities are obtained by radiochemical separation from decay products or by accelerator and reactor routes, depending on the isotope required. ²²⁵Ac supply is especially constrained because it must be isolated from suitable parent nuclides or produced by irradiation, followed by difficult purification from chemically similar actinides and radioactive daughters. Costs and availability are therefore governed by nuclear infrastructure, isotope purity, licensing, and short logistical timelines rather than mining demand. Recycling is mainly recovery from radiochemical processing streams.
Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor.
Actinium has no stable isotopes, so any primordial actinium has long since decayed. In nature and in planetary materials it exists only as a transient member of heavy-element decay chains, especially those derived from uranium and thorium. The heavy nuclei that ultimately feed these chains were produced by neutron-capture processes in earlier stellar events, but actinium itself is not a significant cosmic reservoir.
- Actinium was discovered through its radioactivity before its chemistry could be studied in ordinary amounts.
- The name comes from the Greek word for a ray or beam.
- ²²⁷Ac is a decay product in the ²³⁵U series.
- The element is usually handled at tracer scale, where carrier chemistry is often needed.
- Ac³⁺ is among the largest tripositive actinide ions.
- Separating actinium from lanthanum is chemically difficult because their ionic behavior is similar.
Images
Propriétés
Propriétés physiques
- Rayon atomique (empirique)
- 195 pm Comparer : Rayon atomique (empirique) de tous les éléments →
- Rayon covalent
- 215 pm Comparer : Rayon covalent de tous les éléments →
- Rayon de van der Waals
- 260 pm Comparer : Rayon de van der Waals de tous les éléments →
- Masse volumique
- 1,007 × 104 kg/m³ Comparer : Masse volumique de tous les éléments →
- Volume molaire
- 0,02254 L/mol
- Phase aux CNTP
- Solide Comparer : Phase aux CNTP de tous les éléments →
- Point de fusion
- 1050,85 °C Comparer : Point de fusion de tous les éléments →
- Point d’ébullition
- 3197,85 °C Comparer : Point d’ébullition de tous les éléments →
- Capacité thermique massique
- 0,12 J/(g·K) Comparer : Capacité thermique massique de tous les éléments →
- Capacité thermique molaire
- 27,2 J/(mol·K) Comparer : Capacité thermique molaire de tous les éléments →
- Structure cristalline
- Cubique à faces centrées Comparer : Structure cristalline de tous les éléments →
Propriétés chimiques
- Électronégativité (Pauling)
- 1,1 Comparer : Électronégativité (Pauling) de tous les éléments →
- Affinité électronique
- 0,35 eV
- Énergie d’ionisation (1re)
- 5,380235 eV Comparer : Énergie d’ionisation (1re) de tous les éléments →
- Énergie d’ionisation (2e)
- 11,75004 eV Comparer : Énergie d’ionisation (2e) de tous les éléments →
- Énergie d’ionisation (3e)
- 17,43606 eV Comparer : Énergie d’ionisation (3e) de tous les éléments →
- Énergie d’ionisation (4e)
- 44,800154 eV Comparer : Énergie d’ionisation (4e) de tous les éléments →
- Énergie d’ionisation (5e)
- 55,000189 eV Comparer : Énergie d’ionisation (5e) de tous les éléments →
- États d’oxydation
- +3 Comparer : États d’oxydation de tous les éléments →
- Électrons de valence
- 3 Comparer : Électrons de valence de tous les éléments →
- Configuration électronique
- [Rn] 7s2 6d1
Propriétés thermodynamiques
- Enthalpie de fusion
- 0,14510027 eV Comparer : Enthalpie de fusion de tous les éléments →
- Enthalpie de vaporisation
- 4,145722 eV Comparer : Enthalpie de vaporisation de tous les éléments →
- Enthalpie de sublimation
- 4,456651 eV
- Enthalpie d’atomisation
- 4,456651 eV
- Enthalpie d’atomisation
- 4,207908 eV
Propriétés nucléaires
- Protons
- 89 Comparer : Protons de tous les éléments →
- Neutrons
- 138 Comparer : Neutrons de tous les éléments →
- Isotopes connus
- 33 Comparer : Isotopes connus de tous les éléments →
- Isotopes stables
- 0 Comparer : Isotopes stables de tous les éléments →
- Nombre de masse (isotope le plus stable)
- 227
- Isotope le plus stable
- Ac-227
- Année de découverte
- 1899
Abondance
- Abondance (croûte terrestre)
- 5,5e-10 mg/kg Comparer : Abondance (croûte terrestre) de tous les éléments →
Structure cristalline
- Paramètre de maille a
- 531 pm
Structure électronique
- Électrons par couche
- 2, 8, 18, 32, 18, 9, 2 Comparer : Électrons par couche de tous les éléments →
Identifiants
- Numéro CAS
- 7440-34-8 Comparer : Numéro CAS de tous les éléments →
- Symbole de terme
- 2D3/2
- InChI
- InChI=1S/Ac
- Clé InChI
- QQINRWTZWGJFDB-UHFFFAOYSA-N
Configuration électronique Mesuré
Ac: 6d¹ 7s²[Rn] 6d¹ 7s²1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 6d¹ 7s²Modèle atomique
Les isotopes diffèrent par leur nombre de neutrons, leur masse et leur stabilité — pas par la configuration électronique de l’atome neutre.
Modèle atomique schématique, non à l’échelle.
Empreinte atomique
Spectre d’émission / d’absorption
Distribution isotopique
Aucun isotope stable.
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie |
|---|---|---|---|
| 212 Radioactif | 212,007813 ± 0,000055 | N/D | 895 ms |
| 213 Radioactif | 213,006609 ± 0,000056 | N/D | 738 ms |
| 216 Radioactif | 216,008743 ± 0,000012 | N/D | 440 us |
| 210 Radioactif | 210,009436 ± 0,000062 | N/D | 350 ms |
| 211 Radioactif | 211,007732 ± 0,000057 | N/D | 213 ms |
Phase / État
Explication: 1025,8 °C en dessous du point de fusion (1050,85 °C)
Schématique, non à l’échelle
Points de transition de phase
Énergies de transition
Énergie nécessaire pour faire fondre 1 mol au point de fusion
Énergie nécessaire pour vaporiser 1 mol au point d’ébullition
Énergie nécessaire pour sublimer 1 mol au point de sublimation
Masse volumique
Dans les conditions standard
Dans les conditions standard
Spectres atomiques
Affichage de 10 sur 89. Tri par charge ionique croissante.
Raies répertoriées ?
| Ion | Charge | Nombre total de raies | Probabilités de transition | Désignations des niveaux |
|---|---|---|---|---|
| Ac I | 0 | 153 | 95 | 113 |
| Ac II | +1 | 345 | 294 | 319 |
| Ac III | +2 | 11 | 11 | 11 |
| Ac IV | +3 | 6 | 0 | 0 |
Niveaux répertoriés ?
| Ion | Charge | Niveaux |
|---|---|---|
| Ac I | 0 | 53 |
| Ac II | +1 | 84 |
| Ac III | +2 | 8 |
| Ac IV | +3 | 2 |
| Ac V | +4 | 2 |
| Ac VI | +5 | 2 |
| Ac VII | +6 | 2 |
| Ac VIII | +7 | 2 |
| Ac IX | +8 | 2 |
| Ac X | +9 | 2 |
Rayons ioniques
| Charge | Coordinence | Spin | Rayon |
|---|---|---|---|
| +3 | 6 | N/D | 112.00000000000001 pm |
| +3 | 9 | N/D | 122 pm |
Composés
Isotopes (5)
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie | Mode de désintégration | |
|---|---|---|---|---|---|
| 212 Radioactif | 212,007813 ± 0,000055 | N/D | 895 ms | α ≈100%β+ ? | |
| 213 Radioactif | 213,006609 ± 0,000056 | N/D | 738 ms | α ≈100%β+ ? | |
| 216 Radioactif | 216,008743 ± 0,000012 | N/D | 440 us | α =100%β+ ? | |
| 210 Radioactif | 210,009436 ± 0,000062 | N/D | 350 ms | α ≈100%β+ ? | |
| 211 Radioactif | 211,007732 ± 0,000057 | N/D | 213 ms | α ≈100%β+ ? |
Raies spectrales
Affichage de 50 sur 213. Seules les raies spectrales dont l’intensité a été mesurée sont affichées par défaut.
| Longueur d’onde (nm) | Intensité | Degré d’ionisation | Type | Transition | Précision | Source | |
|---|---|---|---|---|---|---|---|
| 391.4468 nm | 24000 | Ac II | emission | 6d.7s 3D → 5f.7s 3F* | Mesurée | NIST | |
| 417.99772 nm | 17000 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2D* | Mesurée | NIST | |
| 481.2218 nm | 16000 | Ac II | emission | 6d.7s 3D → 7s.7p 3P* | Mesurée | NIST | |
| 438.64 nm | 15000 | Ac II | emission | 6d.7s 1D → 6d.7p 1D* | Mesurée | NIST | |
| 397.736 nm | 13000 | Ac II | emission | 6d2 3F → 6d.7p 3P* | Mesurée | NIST | |
| 445.2188 nm | 12000 | Ac II | emission | 6d.7s 3D → 6d.7p 3F* | Mesurée | NIST | |
| 388.55592 nm | 9000 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 2P* | Mesurée | NIST | |
| 401.9622 nm | 8700 | Ac II | emission | 6d2 3F → 5f.6d 1G* | Mesurée | NIST | |
| 544.6367 nm | 8700 | Ac II | emission | 6d2 3F → 6d.7p 3D* | Mesurée | NIST | |
| 435.9118 nm | 7300 | Ac II | emission | 6d.7s 3D → 7s.7p 3P* | Mesurée | NIST | |
| 446.27307 nm | 6900 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2F* | Mesurée | NIST | |
| 471.65807 nm | 6900 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2F* | Mesurée | NIST | |
| 495.8233 nm | 6800 | Ac II | emission | 6d.7s 1D → 6d.7p 1P* | Mesurée | NIST | |
| 384.304 nm | 6600 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 2P* | Mesurée | NIST | |
| 392.0101 nm | 6500 | Ac II | emission | 6d2 3P → 5f.6d 1D* | Mesurée | NIST | |
| 418.31199 nm | 6400 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 2F* | Mesurée | NIST | |
| 439.67158 nm | 5800 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 2F* | Mesurée | NIST | |
| 419.43971 nm | 5300 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2P* | Mesurée | NIST | |
| 494.5181 nm | 5300 | Ac II | emission | 6d2 3F → 6d.7p 3D* | Mesurée | NIST | |
| 496.0869 nm | 4900 | Ac II | emission | 6d2 3F → 6d.7p 3D* | Mesurée | NIST | |
| 461.39285 nm | 4000 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 2F* | Mesurée | NIST | |
| 527.15603 nm | 3800 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2F* | Mesurée | NIST | |
| 406.31064 nm | 3700 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2D* | Mesurée | NIST | |
| 407.8693 nm | 3700 | Ac II | emission | 6d.7s 3D → 6d.7p 1P* | Mesurée | NIST | |
| 403.4629 nm | 3500 | Ac I | emission | 6d.7s2 2D → 6d2.(3F).7p 4G* | Mesurée | NIST | |
| 420.9682 nm | 3500 | Ac II | emission | 6d.7s 3D → 5f.7s 1F* | Mesurée | NIST | |
| 669.5231 nm | 3300 | Ac II | emission | 6d2 3F → 6d.7p 3F* | Mesurée | NIST | |
| 474.0522 nm | 2600 | Ac II | emission | 6d2 1G → 6d.7p 1F* | Mesurée | NIST | |
| 515.6541 nm | 2100 | Ac II | emission | 6d2 3F → 5f.7s 3F* | Mesurée | NIST | |
| 383.53206 nm | 1900 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2P* | Mesurée | NIST | |
| 488.9102 nm | 1800 | Ac II | emission | 6d2 3F → 5f.7s 3F* | Mesurée | NIST | |
| 480.7843 nm | 1700 | Ac II | emission | 6d.7s 1D → 6d.7p 3F* | Mesurée | NIST | |
| 534.47384 nm | 1700 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4G* | Mesurée | NIST | |
| 400.5469 nm | 1500 | Ac II | emission | 6d2 1G → 5f.6d 3G* | Mesurée | NIST | |
| 536.2615 nm | 1400 | Ac II | emission | 6d2 3F → 6d.7p 1D* | Mesurée | NIST | |
| 522.8309 nm | 1300 | Ac I | emission | 6d.7s2 2D → 6d.7s.(3D).7p 4D* | Mesurée | NIST | |
| 454.408 nm | 1200 | Ac II | emission | 6d2 1D → 7s.7p 1P* | Mesurée | NIST | |
| 461.01055 nm | 1100 | Ac I | emission | 6d.7s2 2D → 6d.7s.(1D).7p 2D* | Mesurée | NIST | |
| 422.599 nm | 1000 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4D* | Mesurée | NIST | |
| 387.7035 nm | 980 | Ac II | emission | 6d.7p 3P* → 5f.7p 3D | Mesurée | NIST | |
| 420.89072 nm | 960 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4D* | Mesurée | NIST | |
| 469.05284 nm | 960 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4F* | Mesurée | NIST | |
| 521.5399 nm | 960 | Ac II | emission | 6d2 3P → 6d.7p 3P* | Mesurée | NIST | |
| 486.88523 nm | 890 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4F* | Mesurée | NIST | |
| 526.4481 nm | 890 | Ac I | emission | 7s2.7p 2P* → 7s2.8s 2S | Mesurée | NIST | |
| 440.21056 nm | 860 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4F* | Mesurée | NIST | |
| 447.18106 nm | 850 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4F* | Mesurée | NIST | |
| 421.80204 nm | 740 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3P).7p 2D* | Mesurée | NIST | |
| 462.16811 nm | 710 | Ac I | emission | 6d2.(3F).7s 4F → 6d2.(3F).7p 4F* | Mesurée | NIST | |
| 426.8209 nm | 570 | Ac II | emission | 6d2 3F → 6d.7p 3P* | Mesurée | NIST |
Propriétés étendues
Rayons covalents (données étendues)
- Rayon covalent (Pyykkö)
- 186 pm
- Rayon covalent (Pyykkö, liaison double)
- 153 pm
- Rayon covalent (Pyykkö, liaison triple)
- 140 pm
Rayons de van der Waals
- Alvarez
- 280 pm
- UFF
- 347,8 pm
- MM3
- 308 pm
Rayons atomiques et métalliques
- Rayon atomique (Rahm)
- 293 pm
Échelles de numérotation
- Mendeleev
- 14
- Pettifor
- 48
- Glawe
- 33
Échelles d’électronégativité
- Ghosh
- 0
Polarisabilité et dispersion
- Polarisabilité dipolaire
- 203 a.u.
- Polarisabilité dipolaire (incertitude)
- 12 a.u.
Transitions de phase et allotropes
| Point de fusion | 1323,15 K |
| Point d’ébullition | 3473,15 K |
Catégories d’états d’oxydation
Données de référence avancées
Détail des rayons cristallins (2)
| Charge | CN | Spin | rcrystal (pm) | Origine |
|---|---|---|---|---|
| 3 | VI | 126 | from r^3 vs V plots, | |
| 3 | IX | — | 136 |
Modes de désintégration des isotopes (56)
| Isotope | Mode | Intensité |
|---|---|---|
| 205 | A | 100% |
| 205 | B+ | — |
| 206 | A | 100% |
| 206 | B+ | — |
| 207 | A | 100% |
| 208 | A | 100% |
| 208 | B+ | — |
| 209 | A | 100% |
| 209 | B+ | — |
| 210 | A | 100% |
Facteurs de diffusion des rayons X (516)
| Énergie (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 1,19484 |
| 10,1617 | — | 1,15672 |
| 10,3261 | — | 1,11982 |
| 10,4931 | — | 1,0841 |
| 10,6628 | — | 1,04952 |
| 10,8353 | — | 1,01604 |
| 11,0106 | — | 0,98234 |
| 11,1886 | — | 0,94669 |
| 11,3696 | — | 0,91233 |
| 11,5535 | — | 0,88152 |
Données complémentaires
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
5.5×10-10 milligrams per kilogram
Références (1)
- [5] Actinium https://education.jlab.org/itselemental/ele089.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
Not Applicable
Références (1)
- [5] Actinium https://education.jlab.org/itselemental/ele089.html
Références
(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.
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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 Actinium.
The element property data was retrieved from publications.