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Polonium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Po | 84 | 209 | 254 °C | 962 °C | Solid | 9.32 g/cm3 | Metal   |
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| General |
| Name, Symbol, Number |
polonium, Po, 84 |
| Chemical series |
metalloids |
| Group, Period, Block |
16, 6, p |
| Appearance |
silvery |
| Standard atomic weight |
(209) g·mol−1 |
| Electron configuration |
[Xe] 6s2 4f14 5d10 6p4 |
| Electrons per shell |
2, 8, 18, 32, 18, 6 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
(alpha) 9.196 g·cm−3 |
| Density (near r.t.) |
(beta) 9.398 g·cm−3 |
| Melting point |
527 K
(254 °C, 489 °F) |
| Boiling point |
1235 K
(962 °C, 1764 °F) |
| Heat of fusion |
ca. 13 kJ·mol−1 |
| Heat of vaporization |
102.91 kJ·mol−1 |
| Heat capacity |
(25 °C) 26.4 J·mol−1·K−1 |
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| Atomic properties |
| Crystal structure |
cubic |
| Oxidation states |
4, 2
(amphoteric oxide) |
| Electronegativity |
2.0 (scale Pauling) |
| Ionization energies |
1st: 812.1 kJ/mol |
| Atomic radius |
190 pm |
| Atomic radius (calc.) |
135 pm |
| Miscellaneous |
| Magnetic ordering |
nonmagnetic |
| Electrical resistivity |
(0 °C) (α) 0.40 µΩ·m |
| Thermal conductivity |
(300 K) ? 20 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 23.5 µm·m−1·K−1 |
| CAS registry number |
7440-08-6 |
| Selected isotopes |
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| References |
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Polonium Compounds
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Source: Wikipedia article Polonium
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Chemistry Quick Facts