Name Curium
Symbol Cm
Atomic Number 96
Atomic Mass 247.0 atomic mass units
Number of Protons 96
Number of Neutrons 151
Number of Electrons 96
Melting Point 1340.0 C
Boiling Point 3110.0 C
Density 13.51 grams per cubic centimeter
Normal Phase Synthetic
Family Rare Earth Metals
Period 7
Cost $160 per milligram



Origin of Name After Marie Sklodowska Curie
Date and Place of Discovery In 1944 at the University of California in Berkeley
Discovered by Glenn T. Seaborg, Ralph James, L. Morgan and Albert Ghiorso
Common Compounds
  • Curium bromide (CmBr3)
  • Curium chloride (CmCl3)
  • Curium dioxide (CmO2)
  • Curium iodide (CmI3)
  • Curium tetrafluoride (CmF4)
  • Curium trioxide (Cm2O3)
Interesting facts
  • It is created by bombarding plutonium with alpha particles.
  • It does not occur in nature.
  • It has been studied greatly as a possible fuel for radioisotope thermoelectric generators.
  • It is chemically similar to gadolinium.
Common Uses There are few commercial applications for curium outside the laboratory.


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