Name Samarium
Symbol Sm
Atomic Number 62
Atomic Mass 150.36 atomic mass units
Number of Protons 62
Number of Neutrons 88
Number of Electrons 62
Melting Point 1072.0 C
Boiling Point 1900.0 C
Density 7.54 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period 6
Cost $7500 per kilogram



Origin of Name From smarskite, a mineral
Date and Place of Discovery In 1879 in Paris, France
Discovered by Paul Emile Lecoq de Boisbaudran
Common Compounds
Interesting facts
  • It is believed to stimulate metabolism, but it is not essential to the health of the human body.
  • It was observed spectroscopically by Jean Charles Galissard de Marignac in dydimia in 1853.
  • Today it is created through an ion exchange from monazite sand which contains many rare earth elements. Monazite sand can contain as much as 2.8% of samarium.
Common Uses
  • Motion picture industry (carbon lights)
  • Optical masers or lasers
  • Nuclear reactors
  • Permanent magnets
  • Chemical reagent in organic synthesis
  • Optical glass that absorbs infrared light
  • Sensitizers for phosphors
  • Ethanol catalyst
  • Treatment of pain due to cancers of the bone (Quadramet)


Photo Courtesy of
Chemical Elements
Jefferson Lab
Los Alamos National Labs
Web Elements

Samarium Atomic Structure Elements by Name Elements by Number Home