What is Erbium?
'''Erbium''' ({{pronEng|ˈɝbiəm}}) is an [[Chemical element|element]] on the [[periodic table]]. Its symbol is '''Er'''. Its [[atomic number]] is 68 which means it has 68 protons in an atom. It is a [[lanthanide]] and, along with [[yttrium]], [[terbium]], and [[ytterbium]], is one of the four elements to be named after the town of [[Ytterby]] in [[Sweden]], all of which are [[rare earth element]]s. ==Related pages== * [[Periodic table]] * [[List of common elements]] {{Periodic Table}} {{chem-stub}} [[Category:Lanthanides]]