Associations to the word «Lanthanide»

Wiktionary

LANTHANIDE, noun. (chemistry) 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.
LANTHANIDE CONTRACTION, noun. (chemistry) (physics) the progressive decrease in the radii of atoms of the lanthanide elements as the atomic number increases; evident in various physical properties of the elements and their compounds

Dictionary definition

LANTHANIDE, noun. Any element of the lanthanide series (atomic numbers 57 through 71).

Wise words

In words, as fashions, the same rule will hold; Alike fantastic, if too new, or old: Be not the first by whom the new are tried, Nor yet the last to lay the old aside.
Alexander Pope