Beryllium vs Radium
| Property | Be Beryllium | Ra Radium |
|---|---|---|
| Atomic number | 4 | 88 |
| Symbol | Be | Ra |
| Name | Beryllium | Radium |
| Category | alkaline-earth-metal | alkaline-earth-metal |
| Standard Atomic Weight | 9.012183 u | 226 u |
| Period | 2 | 7 |
| Group | 2 | 2 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [Rn]7s2 |
| Oxidation states | [0, 1, 2] | [2] |
| Electronegativity (Pauling) | 1.57 | 0.9 |
| Electron affinity | -0.52 eV | 0.096 eV |
| Density | 1850 kg/m³ | 5000 kg/m³ |
| Melting point | 1286.85 °C | 699.85 °C |
| Boiling point | 2470.85 °C | 1139.85 °C |
| Discovery year | 1797 | 1898 |