Fluorine
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Fluorine is a chemical element, having the chemical symbol F. Its atomic number (the number of protons) is 9. It has a standard atomic weight of 18.9984032 g•mol −1, and is typically found as a gas in its elemental form.
Fluorine is considered to be a member of the "Halogen" class of element. At a pressure of 101.325 kPa, it has a boiling point of −182.12 °C, and a melting point of −219.67 °C