Beryllium vs Cesium
| Property | Be Beryllium | Cs Cesium |
|---|---|---|
| Atomic number | 4 | 55 |
| Symbol | Be | Cs |
| Name | Beryllium | Cesium |
| Category | alkaline-earth-metal | alkali-metal |
| Standard Atomic Weight | 9.012183 u | 132.905452 u |
| Period | 2 | 6 |
| Group | 2 | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [Xe]6s1 |
| Oxidation states | [0, 1, 2] | [-1, 1] |
| Electronegativity (Pauling) | 1.57 | 0.79 |
| Electron affinity | -0.52 eV | 0.4716 eV |
| Density | 1850 kg/m³ | 1930 kg/m³ |
| Melting point | 1286.85 °C | 28.44 °C |
| Boiling point | 2470.85 °C | 670.85 °C |
| Discovery year | 1797 | 1860 |