| Atomic Number: | 68 |
| Element Symbol: | Er |
| Element Name: | Erbium |
| Atomic Weight: | 167.259 |
| Group Name: | Lanthanoid |
| Period Number: | 6 (lanthanoid) |
| Block: | f-block |
| Ground State Configuration: | [Xe] 4f12 6s2 |
| Ground State Level: | 3H6 |
| Standard State: | Solid |
| Bond Length: | 346.8 |
| Atomic Radius Empirical: | 175 |
| Atomic Radius Calculated: | 226 |
| Electron Affinity: | 50 |
| First Ionization Energy: | 589.3 |
| Pauling Electronegativity: | 1.24 |
| Allred Rochow Electronegativity: | 1.11 |
| Density Of Solid: | 9066 |
| Molar Volume: | 18.46 |
| Velocity Of Sound: | 2830 |
| Youngs Modulus: | 70 |
| Rigidity Modulus: | 28 |
| Bulk Modulus: | 44 |
| Poissons Ratio: | 0.24 |
| Brinell Hardness: | 814 |
| Vickers Hardness: | 589 |
| Electrical Resistivity: | 86 |
| Melting Point: | 1497 |
| Boiling Point: | 2868 |
| Thermal Conductivity: | 15 |
| Coefficient Of Linear Expansion: | 12.2 |
| Enthalpy Of Fusion: | 19.9 |
| Enthalpy Of Vaporization: | 285 |
| Enthalpy Of Atmization: | 317 |
| Most Common Oxidation Numbers: | 3 |
| Color: | Silvery white |
| Classification: | Metallic |
| Discovered By: | Carl G. Mosander |
| Discovered At: | Sweden |
| Discovered When: | 1842 |
| Origin Of Name: | Named after the village of Ytterby near Vaxholm in Sweden |
Calculate the molecular weight of Erbium or molecular weight Er.
Also see the full list of chemical elements and atomic weights.