Fluorine

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Fluorine is a chemical element, typically found as a gas in its elemental form. It has the chemical symbol F, atomic number (number of protons) Z = 9, and a standard atomic weight of 18.9984032 g/mol.

Fluorine is considered to be a member of the "Halogen" class of elements. At a pressure of 101.325 kPa, it has a boiling point of −182.12 °C, and a melting point of −219.67 °C