Promethium

Atomic Number: 61

Name: Promethium

Symbol: Pm

Atomic Weight: 145

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f⁵6s²

Melting Point: 1168^oC

Boiling Point: 2700^oC

Ionic radius: 1.00 angstroms (+3)