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Plutonium (Pu)
Atomic number 94 · Actinide
| Atomic number | 94 |
|---|---|
| Atomic mass | 244.0 u |
| Molar mass | 244.0 g/mol |
| Category | Actinide |
| Group / period / block | — / 7 / f |
| Electron configuration | [Rn] 5f6 7s2 |
| Electrons per shell | 2, 8, 18, 32, 24, 8, 2 |
| Electronegativity (Pauling) | 1.3 |
| Atomic radius | 175.0 pm |
| Density | 19.7 g/cm³ |
| First ionisation energy | 6.0258 eV |
| Melting point | 913.15 K (640.00 °C) |
| Boiling point | 3501.15 K (3228.00 °C) |
| Common oxidation states | +4 |
Uses
Nuclear reactors, space-probe batteries
Discovery
1940, G.T.Seaborg, J.W.Kennedy, E.M.McMillan, A.C.Wohl