DefinitionA <LANTHANUM> is an <Atom> and a <METALLIC CHEMICAL ELEMENT> with symbol La and atomic number 57. It is a lanthanide, sometimes considered a transition metal
A rare earth metal. White malleable metal, tarnishes in air. Has three crystalline forms. Standard state: solid Colour: silvery white Discoverer: Carl Mosander Date discovered: 1839 Discovered at: Sweden Meaning
