Selenium is a chemical element in the periodic table that has the symbol Se and atomic number 34.
It is a toxic nonmetal that is chemically related to sulfur and tellurium.
It occurs in several different forms but one of these is a stable gray metallike form that conducts electricity better in the light than in the dark and is used in photocells.
For more information about the topic Selenium, read the full article at Wikipedia.org, or see the following related articles:
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