rare earth metal
Rare Earth Metals
Rare earth metals are a group of 17 chemical elements, also known as lanthanides, found in the Earths crust. They include lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, a......