Name Gadolinium
Symbol Gd
Atomic Number 64
Atomic Mass 157.25 atomic mass units
Number of Protons 64
Number of Neutrons 93
Number of Electrons 64
Melting Point 1311.0° C
Boiling Point 3233.0° C
Density 7.895 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period Number 6
Cost $485 per kilogram



Origin of Name After the mineral, gadolinite, named after
Finnish mineralogist, Johan Gadolin
Date and Place of Discovery 1880 in France
Discovered by Jean de Marignac
Common Compounds
Interesting facts
  • It is never found in nature as the free element.
  • It is found in rare minerals like monazite and bastnäsite
  • It is relatively stable in dry air unlike the other rare earth elements.
  • It tarnishes quickly when exposed to moist air.
  • It reacts slowly with water.
  • It dissolves in dilute acid.
Common Uses
  • Microwaves
  • Color television tubes
  • Compact discs and computer memory chips
  • Nuclear marine propulsion systems
  • Alloys for iron and chromium
  • Intravenous radio contrast agents and magnetic resonance imaging in the medical field
  • Neutron radiography


Photo Courtesy of
Chemical Elements
Facts About
Jefferson Lab

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