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Actinium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Ac | 89 | 227 | 1050 °C | 3198 °C | Solid | 10 g/cm3 | Metal  |
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| General |
| Name, Symbol, Number |
actinium, Ac, 89 |
| Chemical series |
actinides |
| Group, Period, Block |
3, 7, f |
| Appearance |
silvery |
| Standard atomic weight |
(227) g·mol−1 |
| Electron configuration |
[Rn] 6d1 7s2 |
| Electrons per shell |
2, 8, 18, 32, 18, 9, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
10 g·cm−3 |
| Melting point |
(circa) 1323 K
(1050 °C, 1922 °F) |
| Boiling point |
3471 K
(3198 °C, 5788 °F) |
| Heat of fusion |
14 kJ·mol−1 |
| Heat of vaporization |
400 kJ·mol−1 |
| Heat capacity |
(25 °C) 27.2 J·mol−1·K−1 |
| Atomic properties |
| Crystal structure |
cubic face centered |
| Oxidation states |
3
(neutral oxide) |
| Electronegativity |
1.1 (scale Pauling) |
| Ionization energies |
1st: 499 kJ/mol |
| 2nd: 1170 kJ/mol |
| Atomic radius |
195 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Thermal conductivity |
(300 K) 12 W·m−1·K−1 |
| CAS registry number |
7440-34-8 |
| Selected isotopes |
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| References |
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Actinium Compounds: N/A
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Source: Wikipedia article Actinium
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Chemistry Quick Facts