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The Clue

Element used in photoelectric cells (8 letter answer)

The Answer

SELENIUM

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Notes

The answer SELENIUM is so rare that it appears less than once every 2500 puzzles.

Related Clues

Element #34

Definition

SELENIUM as a noun:

1. (selenium, Se, atomic number 34) = a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)