Periodic Table of the Elements
Periodic Table




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name Promethium
latin Promethium
french Prométhium
german Promethium
symbol Pm
proton number 61
atomic weight [145]
Pauling electronegativity -
electronic configuration [Xe] 4f55d06s2
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melting point 1373 K, 1100°C, 2012°F
boiling point 3273 K, 3000°C, 5432°F
group -
period 6
state (by 20°C) solid
oxidation states +3
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discussion board
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Year of discovery Discoverers
1945 Jacob A. Marinsky
Lawrence E. Glendenin
Charles D. Coryell

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