Answer: cesium

AnswerCrossword Clue
CESIUMElectropositive element
CESIUMMetal in atomic clocks
CESIUMElement found in photoelectric cells
CESIUMElement used in photoelectric cells
CESIUMSoft, silvery-white element
CESIUMElement used in atomic clocks
CESIUMElement in atomic clocks
CESIUMPhotoelectric cell component
CESIUMPhotoelectric cell element
CESIUMHighly reactive metal
CESIUMElement in photoelectric cells
CESIUMAtomic number 55
cesiumrare, 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
cesiuma silver-white soft ductile element of the alkali metal group that is the most electropositive element known and that is used especially in photoelectric cells see element table