Iodine
From Citizendium, the Citizens' Compendium
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Iodine is a chemical element, having the chemical symbol I. Its atomic number (the number of protons) is 53. It has a Standard Atomic Weight of 126.90447, and is typically found as a solid in its elemental form.
Iodine is considered to be a member of the "Halogen" family of elements, and has a boiling point of 184.4°C.

