| 1. selenium [ Synonyms: atomic number 34, se] | |
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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)
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ایک غیر دھاتی عنصر۔ |