Pm
Promethium
61
Atomic Number: 61
Atomic mass: [145]
Ionization energy: 540
Electronaffinity: -50
Covalent radius:
Calculated radius: 205
Empirical radius: 185
Vanderwaals radius:
Electronegativity: 1.13
Density: 7.26
Oxidation states: 3
Melting point: 1373
Boiling point: 3273
Electron configuration: [Xe] 4f5 6s2
Element group: 8
Element period: 8

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