Yttrium vs Erbium
| Property | Y Yttrium | Er Erbium |
|---|---|---|
| Atomic number | 39 | 68 |
| Symbol | Y | Er |
| Name | Yttrium | Erbium |
| Category | transition-metal | lanthanide |
| Standard Atomic Weight | 88.90584 u | 167.259 u |
| Period | 5 | 6 |
| Group | 3 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Kr]5s24d1 | [Xe]6s24f12 |
| Oxidation states | [0, 1, 2, 3] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 1.22 | 1.24 |
| Electron affinity | 0.307 eV | 0.312 eV |
| Density | 4470 kg/m³ | 9070 kg/m³ |
| Melting point | 1521.85 °C | 1528.85 °C |
| Boiling point | 3344.85 °C | 2867.85 °C |
| Discovery year | 1794 | 1843 |