Argon vs Cesium
| Property | Ar Argon | Cs Cesium |
|---|---|---|
| Atomic number | 18 | 55 |
| Symbol | Ar | Cs |
| Name | Argon | Cesium |
| Category | noble-gas | alkali-metal |
| Standard Atomic Weight | 39.948 u | 132.905452 u |
| Period | 3 | 6 |
| Group | 18 | 1 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ne]3s23p6 | [Xe]6s1 |
| Oxidation states | [0] | [-1, 1] |
| Electronegativity (Pauling) | N/A | 0.79 |
| Electron affinity | -1 eV | 0.4716 eV |
| Density | 1.7837 kg/m³ | 1930 kg/m³ |
| Melting point | -189.35 °C | 28.44 °C |
| Boiling point | -185.85 °C | 670.85 °C |
| Discovery year | 1894 | 1860 |