Gallium vs Erbium
| Property | Ga Gallium | Er Erbium |
|---|---|---|
| Atomic number | 31 | 68 |
| Symbol | Ga | Er |
| Name | Gallium | Erbium |
| Category | post-transition-metal | lanthanide |
| Standard Atomic Weight | 69.723 u | 167.259 u |
| Period | 4 | 6 |
| Group | 13 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d104p1 | [Xe]6s24f12 |
| Oxidation states | [-5, -4, -3, -2, -1, 0, 1, 2, 3] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 1.81 | 1.24 |
| Electron affinity | 0.3 eV | 0.312 eV |
| Density | 5910 kg/m³ | 9070 kg/m³ |
| Melting point | 29.76 °C | 1528.85 °C |
| Boiling point | 2203.85 °C | 2867.85 °C |
| Discovery year | 1875 | 1843 |