84Po[209]
Polonium (Po)
Element 84 · Post-transition metal
Polonium (Po) is a chemical element with atomic number 84. It is classified as a post-transition metal in period 6, group 16 of the periodic table (the p-block). Its most stable known isotope has mass number 209 and its ground-state electron configuration is [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴.
Polonium facts
| Atomic number (Z) | 84 |
|---|---|
| Symbol | Po |
| Mass number of most stable isotope | [209] |
| Category | Post-transition metal |
| Group | 16 |
| Period | 6 |
| Block | p-block |
| Electron configuration | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴ |
| Electronegativity (Pauling) | 2.0 |
| State at 20 °C | Solid |
| Protons / electrons | 84 / 84 |
| Neutrons (most common isotope, approx.) | 125 |
| Molar mass | 209 g/mol |