Revision as of 14:14, 23 January 2021 by imported>Double sharp
[[Category:Template:Pagetype with short description]]
Actinium, 89Ac |
| Actinium |
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| Pronunciation | (Template:Respell) |
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| Appearance | silvery-white, glowing with an eerie blue light;[1] sometimes with a golden cast[2] |
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| Mass number | [227] |
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| Actinium in the periodic table |
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| Atomic number (Z) | 89 |
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| Group | group n/a |
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| Period | period 7 |
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| Block | f-block |
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| Electron configuration | [Rn] 6d1 7s2 |
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| Electrons per shell | 2, 8, 18, 32, 18, 9, 2 |
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| Physical properties |
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| Phase at STP | solid |
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| Melting point | 1500 K (1227 °C, 2240 °F) (estimated)[2] |
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| Boiling point | 3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)[2] |
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| Density (near r.t.) | 10 g/cm3 |
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| Heat of fusion | 14 kJ/mol |
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| Heat of vaporization | 400 kJ/mol |
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| Molar heat capacity | 27.2 J/(mol·K) |
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| Atomic properties |
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| Oxidation states | +3 (a strongly basic oxide) |
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| Electronegativity | Pauling scale: 1.1 |
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| Ionization energies | - 1st: 499 kJ/mol
- 2nd: 1170 kJ/mol
- 3rd: 1900 kJ/mol
- (more)
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| Covalent radius | 215 pm |
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| Spectral lines of actinium |
| Other properties |
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| Natural occurrence | from decay |
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| Crystal structure | face-centered cubic (fcc) |
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| Thermal conductivity | 12 W/(m·K) |
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| CAS Number | 7440-34-8 |
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| History |
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| Discovery and first isolation | Friedrich Oskar Giesel (1902) |
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| Named by | André-Louis Debierne (1899) |
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| Main isotopes of actinium |
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Category: Actinium | references |
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References
These references will appear in the article, but this list appears only on this page.
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