| 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 |