| From Wikipedia, the free encyclopediaPolonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Applications of polonium are few. | |||
Polonium in the periodic table | |||
|---|---|---|---|
| Symbol | Po | ||
| Atomic number | 84 | ||
| Group | 16 | ||
| Period | 6 | ||
| Block | p | ||
| Element category | Post-Transition Metal | ||
Physical properties | |||
| Phase at STP | Solid | ||
| Density | 9.196 g/cm3 | ||
| Atomic weight | 209 u | ||
| Melting point | 527 K 253.85 °C 488.93 °F | ||
| Boiling point | 1235 K 961.85 °C 1763.33 °F | ||
Atomic properties | |||
| Electronegativity (Pauling Scale) | 2 | ||
| Electron affinity | 136 kJ/mol | ||
| Oxidation states | −2, +2, +4, +5, +6 (an amphoteric oxide) | ||
| Ionization energies |
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Electron configuration | |||
| Elektronkonfiguration (shorthand) | [Xe] 4f14 5d10 6s2 6p4 | ||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p4 | ||
| Electrons per shell | 2, 8, 18, 32, 18, 6 | ||
History | |||
| Discovered | 1898 | ||
| Discovered by | Pierre Curie Marie Curie | ||