1st aresst made by Henri Moissan
Fluorine is very poisonous as a gas form and caused damage to the respiratory tract and tissue damage too. Henri Moissan isolated it by mixing platinum with it to use as an apparatus and after this he soon won the Nobel Prize in Chemistry.
Fluorine looks like a gas at room temperature and its atomic mass is 18.998. The atomic number is 9, its yellow-greenish and its known for being a non-metal. Fluorine also looks like ions when in minerals and is part of the halogen family. It has 9 protons, 10 neutrons, and 9 electrons.