Boron vs Rubidium
| Property | B Boron | Rb Rubidium |
|---|---|---|
| Atomic number | 5 | 37 |
| Symbol | B | Rb |
| Name | Boron | Rubidium |
| Category | metalloid | alkali-metal |
| Standard Atomic Weight | 10.8135 u | 85.4678 u |
| Period | 2 | 5 |
| Group | 13 | 1 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s22p1 | [Kr]5s1 |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [-1, 1] |
| Electronegativity (Pauling) | 2.04 | 0.82 |
| Electron affinity | 0.27972 eV | 0.4859 eV |
| Density | 2370 kg/m³ | 1530 kg/m³ |
| Melting point | 2074.85 °C | 39.31 °C |
| Boiling point | 3999.85 °C | 687.85 °C |
| Discovery year | 1808 | 1861 |