Krypton vs Cesium
| Property | Kr Krypton | Cs Cesium |
|---|---|---|
| Atomic number | 36 | 55 |
| Symbol | Kr | Cs |
| Name | Krypton | Cesium |
| Category | noble-gas | alkali-metal |
| Standard Atomic Weight | 83.798 u | 132.905452 u |
| Period | 4 | 6 |
| Group | 18 | 1 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Xe]6s1 |
| Oxidation states | [0, 1, 2] | [-1, 1] |
| Electronegativity (Pauling) | 3 | 0.79 |
| Electron affinity | -1 eV | 0.4716 eV |
| Density | 3.733 kg/m³ | 1930 kg/m³ |
| Melting point | -157.36 °C | 28.44 °C |
| Boiling point | -153.42 °C | 670.85 °C |
| Discovery year | 1898 | 1860 |