Zirconium vs Polonium
| Property | Zr Zirconium | Po Polonium |
|---|---|---|
| Atomic number | 40 | 84 |
| Symbol | Zr | Po |
| Name | Zirconium | Polonium |
| Category | transition-metal | metalloid |
| Standard Atomic Weight | 91.224 u | 209 u |
| Period | 5 | 6 |
| Group | 4 | 16 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d2 | [Xe]6s24f145d106p4 |
| Oxidation states | [1, 2, 3, 4] | [-2, 2, 4, 5, 6] |
| Electronegativity (Pauling) | 1.33 | 2 |
| Electron affinity | 0.426 eV | 1.9 eV |
| Density | 6520 kg/m³ | 9320 kg/m³ |
| Melting point | 1854.85 °C | 253.85 °C |
| Boiling point | 4408.85 °C | 961.85 °C |
| Discovery year | 1789 | 1898 |