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Atomic Number: 89
Name: Actinium
Symbol: Ac
Atomic Weight: 227.028
Electron configuration: 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p66d17s2
Melting Point: 1050oC
Boiling Point: 3200oC
Ionic radius: 1.18 angstroms (+3)
