Lanthanum n. : A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La.

Example:
Element Lanthanum can the element exist @ all states? what temp does it become a solid, a liquid, and/or gas?

Taxonomy
lanthanum, rare earths, oxide, 06-06, element, Lanthanum oxide, Lanthanum fluoride, glass, isotopes of lanthanum, stable, compounds, Monazite, Lanthanum carbonate, purification, ammonium nitrate, CRC Press, lanthanum chloride, nitrates.

Defination from the web:
... Lanthanum is malleable, ductile, and soft metal, which oxidizes rapidly when exposed to air. ... Main article: isotopes of lanthanum ...