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94
Pu
[244]
Plutonium
Actinides · Group 8 · Period 6–7 (f)
Atomic properties
| Atomic number | 94 |
|---|---|
| Symbol | Pu |
| Standard atomic weight | [244] |
| Classification | Actinides |
| Group | f-block series |
| Period | 7 |
| Block | f-block (actinide) |
| Electron configuration | [Rn] 5f6 7s2 |
| Electronegativity (Pauling) | 1.28 |
| Common oxidation states | +4, +6 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 19.85 g/cm³ |
| Melting point | 639.4 °C |
| Boiling point | 3228 °C |
| Discovered | 1940 |
| CAS number | — |