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Name Promethium
Symbol Pm
Atomic number 61
Atomic mass 145 amu
Normal state Solid
Classification Metallic
Crystal structure Hexagonal
Color Silvery / Metallic
Date of discovery 1945
Name of discoverer J.A. Marinsky, L.E. Glendenin and C.D. Coryell
Name origin From Prometheus who stole the fire of the sky and gave it to mankind.
Uses Used in highly specialized miniature batteries.
Obtained from All the promethium originally present when the Earth formed has disappeared due to radioactive decay. Only very small trace amounts are found in uranium ores as a product of nuclear fission.