94Pu[244]
Plutonium (Pu)
Element 94 · Actinide
Plutonium (Pu) is a chemical element with atomic number 94. It is classified as an actinide in period 7 of the periodic table (the f-block). Its most stable known isotope has mass number 244 and its ground-state electron configuration is [Rn] 5f⁶ 7s².
Plutonium facts
| Atomic number (Z) | 94 |
|---|---|
| Symbol | Pu |
| Mass number of most stable isotope | [244] |
| Category | Actinide |
| Group | — (f-block) |
| Period | 7 |
| Block | f-block |
| Electron configuration | [Rn] 5f⁶ 7s² |
| Electronegativity (Pauling) | 1.28 |
| State at 20 °C | Solid |
| Protons / electrons | 94 / 94 |
| Neutrons (most common isotope, approx.) | 150 |
| Molar mass | 244 g/mol |