Erbium (Er)
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Atomic Data for Erbium (Er)
Atomic Number = 68
Atomic Weight = 167.26
Reference E95
Isotope Mass Abundance Spin Mag Moment
162Er 161.928775 0.14% 0
164Er 163.929198 1.61% 0
166Er 165.930290 33.6% 0
167Er 166.932046 22.95% 7/2 -0.5665
168Er 167.932368 26.8% 0
170Er 169.935461 14.9% 0
Er I Ground State 1s22s22p63s23p63d104s24p64d105s25p64f126s2 3H6
Ionization energy 49262 cm-1 (6.1077 eV) Ref. WSPC78
Er II Ground State 1s22s22p63s23p63d104s24p64d105s25p64f12(3H6)6s (6,1/2)13/2
Ionization energy 96200 cm-1 (11.93 eV) Ref. SR65