Explosives Exponent Extensive Property Extraction Extrapolate Erbium , symbol Er, metallic element, whose atomic number is 68. The Swedish chemist Carl Gustav Mosander discovered erbium in 1843.
Erbium occurs mostly in the same mineral s and in the same areas as dysprosium.
One of the rare earth elements , erbium is 43rd in abundance among the elements of the earth's crust. The atomic weight of erbium is 167.26. All Rights Reserved Worldwide.