Symbol Er
Atomic Number 68
Atomic Mass 167.26 g.mol -1
Discovered by Nobel Institute for Physics in 1957

Chemical Properties of Erbium

Group Lanthanides Melting point 1522 °C
Period 6 Boiling point 2867°C
Block f Density (g cm−3) 9.07
Atomic number 68 Relative atomic mass 167.259  
State at 20°C Solid Key isotopes 166Er 
Electron configuration [Xe] 4f126s2  CAS number 7440-52-0
ChemSpider ID 22416 ChemSpider is a free chemical structure database

What is Erbium?

  • Erbium is a chemical radioactive element present as the eleventh element in the lanthanide series of the periodic table. The pure form of the element is metal.
  • Naturally, occurring Erbium is found in chemical combination with other naturally occurring elements. When it is artificially isolated its appearance is a silvery-white solid metal.

Uses of Erbium

  • This metal is used to colour the lenses of glasses.
  • It is also used in the control rods of nuclear reactors.
  • It has a vital application in the production of metal alloys.
  • Erbium ion’s unique wavelength aids laser surgery.

Properties of Erbium

  • The pure form of Erbium metal is malleable.
  • It is very stable and it does not oxidize quickly when it is exposed to air (when compared to other rare earth metals).
  • It comprises properties that are similar to other rare earth materials or lanthanides.
  • It is an interesting probe for a large variety of physical effects due to its unique properties.

Certain Facts About Erbium

  • Although Erbium is considered as a rare metal, it is actually not since it is the forty-fifth most abundant element found in the earth’s crust.

Frequently Asked Questions – FAQs


To which block does Erbium belong?

Erbium belongs to f-block elements.

What is the electron configuration of Erbium?

The electron configuration of Erbium is [Xe] 4f12 6s2.

To which period does Erbium belong?

Period 6.

What is the atomic number of Erbium?

The atomic number of Hassium is 68.
Take up a quiz on Erbium


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