Thallid - Fallen Empires

Thallides are compounds containing anions composed of thallium. Thallium may occur as a monatomic ion (Tl5− in LiMg2Tl), as a cluster of several atoms (e.g. Tl48−), or as a polyatomic structure Tlnn− in thallides. They are a subclass of trielides, which also includes gallides and indides. A more general classification is polar intermetallics, as clusters contain delocalized multicentre bonds. Thallides were discovered by Eduard Zintl in 1932.