Lantanium vs. Lanthanum

Lantaniumnoun

See Lanthanum.

Lanthanumnoun

(uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.

Lanthanumnoun

(countable) An atom of this element.

Lanthanumnoun

A rare element of the rare earth group of the metals, of atomic number 57, allied to aluminum. 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 earth elements with which it is usually associated. Atomic weight 138.9. Symbol La.

Lanthanumnoun

a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

Lanthanum

Lanthanum is a chemical element with the symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.