Erbium

Lanthanide

Symbol: Er

Atomic Number: 68

Standard State: Solid

Atomic Mass: 167.26

Electron Configuration: [Xe]6s2 4f12

Electronegativity: 1.24

Atomic Radius: 235

Ionization Energy: 6.108

Melting Point: 1802

Boiling Point: 3141

Density: 9.07

Year Discovered: 1843