What is the meaning of Rare_earth_element?
Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts, which includes the lanthanides plus yttrium, scandium.
Source: wiktionary.orgSearch words containing
Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts, which includes the lanthanides plus yttrium, scandium.
Source: wiktionary.orgSearch words containing