Manganese
From Citizendium, the Citizens' Compendium
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Manganese is a chemical element, having the chemical symbol Mn. Its atomic number (the number of protons) is 25. It has a Standard Atomic Weight of 54.94, and is typically found as a solid in its elemental form.
Manganese is considered to be a member of the "Transition Metal" family of elements, and has a boiling point of 2061°C.

