Erbium

Atomic Number: 68

Name: Erbium

Atomic symbol: Er

Atomic Weight: 167.26

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹²6s²

Melting Point: 1522^oC

Boiling Point: 2510^oC

Density: 9.1 g/cm³

Ionic radius: 0.88 anstroms (+3)

Metallic radius: 1.76 angstroms