As defined by IUPAC, rare earth elements or rare earth metals are a collection of chemical elements in the periodic table. The thirty rare earth elements are composed of the lanthanide and actinide series. Despite their name, rare earth elements are relatively plentiful in the Earth’s crust, with cerium being the 25th most abundant element (similar to copper). One element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made. All of the rare earth metals are found in group 3 of the periodic table, and the 6th and 7th periods. The Rare EarthElements are made up of two series of elements, the Lanthanide and Actinide Series.
List Of Rare Earth Elements
Lanthanide Series (lanthanoids)