Arsenic
From Citizendium, the Citizens' Compendium
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Arsenic is a chemical element, having the chemical symbol As. Its atomic number (the number of protons) is 33. It has a Standard Atomic Weight of 74.92, and is typically found as a solid in its elemental form.
Arsenic is considered to be a member of the "Metalloid" family of elements, and has a boiling point of 603°C*.
