Answer: caesiums

AnswerCrossword Clue
caesiumsCAESIUM, a metallic element
caesiumsrare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20┬░C; melts at 28.5┬░C