Name Dysprosium
Symbol Dy
Atomic Number 66
Atomic Mass 162.5 atomic mass units
Number of Protons 66
Number of Neutrons 97
Number of Electrons 66
Melting Point 1412.0 C
Boiling Point 2562.0 C
Density 8.536 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period 6
Cost $300 per kilograms



Origin of Name From the Greek dysprositos, meaning hard to get at
Date and Place of Discovery In 1886 in France
Discovered by Paul Emile Lecoq de Boisbaudran
Common Compounds
  • Dysprosium chloride (DyCl3)
  • Dysprosium fluoride (DyF3)
  • Dysprosium iodide (DyI3)
  • Dysprosium oxide (DyO3)
  • Dysprosium sulfate [Dy2(SO4)3]
Interesting facts
  • It is not found freely in nature, but is found in minerals like: xenotime, fergusonite, gadolinite, euxenite, polycrase, blomstrandine, monazite and bastnasite
  • Most of it is mined from clay ores in sourthern China.
  • It is stable in air at room temperature.
  • When it dilutes with mineral acids, hydrogen is emitted.
  • It oxides very easily.
  • It can be cut with bolt-cutters, but not with a knife.
  • It is very paramagnetic.
  • Its characteristics are affected by small amounts of impurities.
Common Uses
  • Laser materials
  • Nuclear control rods
  • Nuclear reactors
  • Compact discs
  • Magnetic resonance imaging
  • Nano-magnets


Photo Courtesy of
American Elements
Chemical Elements
Jefferson Lab

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