lanthanides

/L AE1 N TH AH0 N AY0 D Z/
noun
  1. 1

    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.

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Source: https://en.wiktionary.org/wiki/lanthanide, https://en.wiktionary.org/wiki/lanthanides