Name Holmium
Symbol Ho
Atomic Number 67
Atomic Mass 164.930 atomic mass units
Number of Protons 67
Number of Neutrons 98
Number of Electrons 67
Melting Point 1470.0 C
Boiling Point 2720.0 C
Density 8.54 grams per cubic centimeter
Normal Phase Solid
Family Rare Earth Metals
Period 6
Cost $10 per gram



Origin of Name From the Latin word holm, or Stockholm
Date and Place of Discovery In 1878 in France - spectroscopically
In 1879 in Sweden
Discovered by Jacques-Louis Soret and Marc Delafontaine and
independently in 1879 by Per Teodor Cleve
Common Compounds
Interesting facts
  • It is soft and malleable.
  • It resists corrosion fairly well.
  • It is not found freely in nature, but is found in minerals like monazite and gadolinite.
  • It is commercially extracted via ion exchange from monazite sand, but it's not easy to separate from other rare earth metals.
  • It is stable in dry air at room temperature.
  • In moist air or at higher temperatures, it will oxidize quickly.
  • It has the highest magnetic moment.
Common Uses
  • Magnetic poles
  • Nuclear control rods
  • Solid state lasers
  • Microwaves
  • Coloring glass yellow
  • Spectrophotometers
  • Cubic zirconia
  • Medically reduction of kidney stones


Photo Courtesy of About.com
Chemical Elements
Jefferson Lab

Holmium Atomic Structure Elements by Name Elements by Number Home