Hydrogen vs Cesium
| Property | H Hydrogen | Cs Cesium |
|---|---|---|
| Atomic number | 1 | 55 |
| Symbol | H | Cs |
| Name | Hydrogen | Cesium |
| Category | nonmetal | alkali-metal |
| Standard Atomic Weight | 1.007975 u | 132.905452 u |
| Period | 1 | 6 |
| Group | 1 | 1 |
| Block | s | s |
| Phase at STP | gas | solid |
| Electron configuration | 1s1 | [Xe]6s1 |
| Oxidation states | [-1, 1] | [-1, 1] |
| Electronegativity (Pauling) | 2.2 | 0.79 |
| Electron affinity | 0.75419 eV | 0.4716 eV |
| Density | 0.08988 kg/m³ | 1930 kg/m³ |
| Melting point | -259.34 °C | 28.44 °C |
| Boiling point | -252.87 °C | 670.85 °C |
| Discovery year | 1766 | 1860 |