Er
Erbium
68
Atomic Number: 68
Atomic mass: 167.2593
Ionization energy: 589
Electronaffinity: -50
Covalent radius:
Calculated radius: 226
Empirical radius: 175
Vanderwaals radius:
Electronegativity: 1.24
Density: 9.07
Oxidation states: 3
Melting point: 1770
Boiling point: 3141
Electron configuration: [Xe] 4f12 6s2
Element group: 15
Element period: 8

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