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Promethium
Atomic Number: 61
Name: Promethium
Atomic symbol: Pm
Atomic Weight: 146.9151
Electron configuration: 1s22s22p63s23p63d104s24p64d105s25p64f56s2
Melting Point: 1168oC
Boiling Point: 2700oC
Ionic radius: 1.00 angstroms (+3)