Selenium
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Selenium is a chemical element, having the chemical symbol Se.
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Its atomic number (the number of protons) is 34. It has a Standard Atomic Weight of 78.96(3), and is typically found as a solid in its elemental form.
Selenium is considered to be a member of the "Non-Metal" class of elements, has a boiling point of 685 °C , and a melting point of 220.5 °C .