Lanthanide Moderate

Lanthanide has 2 different meanings across 1 category:

Definitions

Noun

any element of the lanthanide series (atomic numbers 57 through 71)

rare earth rare-earth element lanthanoid lanthanide lanthanon

Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides.