| Element | Erbium |
| Symbol | Er |
| Atomic Number | 68 |
| Molar Mass | 167.26 g mol-1 |
| Electron Configuration | [Xe]4f126s2 |
| Normal State | solid metal |
| Density @STP | 9.04 g cm-3 |
| Melting Point | 1529oC |
| Boiling Point | 2868oC |
| Stable Isotopes | 162Er, 164Er, 166Er, 167Er, 168Er, 170Er |
| Atomic Radius | 176 pm |
| Ionic Radius | 89 (3+) pm |
| Electronegativity (Pauling) | 1.24 |
| Ionization Energy (1st) | 589 kJ mol-1 |
| Ionization Energy (2nd) | 1151 kJ mol-1 |
| Ionization Energy (3rd) | 2194 kJ mol-1 |
| Molar Heat Capacity | 28.1 J K-1mol-1 |
| Standard Molar Entropy | 73.1 J K-1mol-1 |
| Enthalpy of Fusion | 17.2 kJ mol-1 |
| Enthalpy of Vapourization | 292.9 kJ mol-1 |
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