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Polonium (Po)
Atomic number 84 · Metalloid
| Atomic number | 84 |
|---|---|
| Atomic mass | 209.0 u |
| Molar mass | 209.0 g/mol |
| Category | Metalloid |
| Group / period / block | 16 / 6 / p |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p4 |
| Electrons per shell | 2, 8, 18, 32, 18, 6 |
| Electronegativity (Pauling) | 2.0 |
| Atomic radius | 190.0 pm |
| Density | 9.2 g/cm³ |
| First ionisation energy | 8.4181 eV |
| Melting point | 527.15 K (254.00 °C) |
| Boiling point | 1235.15 K (962.00 °C) |
| Common oxidation states | -2, +2, +4 |
Uses
Anti-static brushes, heat source (radioactive)
Discovery
1898, Pierre and Marie Curie