Thulium

Atomic Number: 69

Name: Thulium

Atomic symbol: Tm

Atomic Weight: 168.934

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹³6s²

Melting Point: 1545^oC

Boiling Point: 1727^oC

Density: 9.3 g/cm³

Ionic radius: 0.87 angstroms (+3)

Metallic radius: 1.75 angstroms