Promethium (Pm)
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Atomic Data for Promethium (Pm)
Atomic Number = 61
Atomic Weight = 145
Reference E95
Isotope Mass Abundance Spin Mag Moment
145Pm 144.912743 0 5/2
146Pm 145.914708 0 3
147Pm 146.915135 0 7/2 +2.7
149Pm 148.918332 0 7/2 ±3.3
151Pm 150.921203 0 5/2 ±1.8
Pm I Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f56s2 6H°5/2
Ionization energy 45020 cm-1 (5.582 eV) Ref. WSPC78
Pm II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f56s 7H°2
Ionization energy 87900 cm-1 (10.90 eV) Ref. SR65