Answer: rareearthmetals

AnswerCrossword Clue
RAREEARTHMETALS

With an atomic number 57 through 71

RAREEARTHMETALS

Yttrium and lutetium, e.g

RAREEARTHMETALS

Cerium and erbium, e.g.

RAREEARTHMETALS
Cerium and yttrium, for two
RAREEARTHMETALS
Erbium, terbium and the like