Copper vs Rubidium
| Property | Cu Copper | Rb Rubidium |
|---|---|---|
| Atomic number | 29 | 37 |
| Symbol | Cu | Rb |
| Name | Copper | Rubidium |
| Category | transition-metal | alkali-metal |
| Standard Atomic Weight | 63.546 u | 85.4678 u |
| Period | 4 | 5 |
| Group | 11 | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s13d10 | [Kr]5s1 |
| Oxidation states | [-2, 0, 1, 2, 3, 4] | [-1, 1] |
| Electronegativity (Pauling) | 1.9 | 0.82 |
| Electron affinity | 1.235 eV | 0.4859 eV |
| Density | 8933 kg/m³ | 1530 kg/m³ |
| Melting point | 1084.62 °C | 39.31 °C |
| Boiling point | 2561.85 °C | 687.85 °C |
| Discovery year | N/A | 1861 |