Symbol: Er

Atomic Number: 68

Atomic Weight: 167.26

Erbium is a chemical element that is part of the lanthanide series. The so-called lanthanide elements include the fifteen metallic chemical elements with atomic numbers ranging from 57 to 71, as well as scandium and yttrium. The last two are not lanthanide elements, strictly speaking, but are categorized along with them because they are chemically similar. This series is known to constitute the rare earth elements. The name of these elements is misleading because they are actually not rare at all. They are called "rare" because they are rarely found in concentrated and exploitable forms. When they are, they are...Read More