Boron vs Erbium
| Property | B Boron | Er Erbium |
|---|---|---|
| Atomic number | 5 | 68 |
| Symbol | B | Er |
| Name | Boron | Erbium |
| Category | metalloid | lanthanide |
| Standard Atomic Weight | 10.8135 u | 167.259 u |
| Period | 2 | 6 |
| Group | 13 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s22p1 | [Xe]6s24f12 |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 2.04 | 1.24 |
| Electron affinity | 0.27972 eV | 0.312 eV |
| Density | 2370 kg/m³ | 9070 kg/m³ |
| Melting point | 2074.85 °C | 1528.85 °C |
| Boiling point | 3999.85 °C | 2867.85 °C |
| Discovery year | 1808 | 1843 |