Calcium vs Rubidium
| Property | Ca Calcium | Rb Rubidium |
|---|---|---|
| Atomic number | 20 | 37 |
| Symbol | Ca | Rb |
| Name | Calcium | Rubidium |
| Category | alkaline-earth-metal | alkali-metal |
| Standard Atomic Weight | 40.078 u | 85.4678 u |
| Period | 4 | 5 |
| Group | 2 | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s2 | [Kr]5s1 |
| Oxidation states | [1, 2] | [-1, 1] |
| Electronegativity (Pauling) | 1 | 0.82 |
| Electron affinity | 0.0245 eV | 0.4859 eV |
| Density | 1540 kg/m³ | 1530 kg/m³ |
| Melting point | 841.85 °C | 39.31 °C |
| Boiling point | 1483.85 °C | 687.85 °C |
| Discovery year | 1808 | 1861 |