Fluorine notes

Fluorine has atomic number 9 and the symbol F.

A fluorine atom exists of 9 electrons, 9 protons and 10 neutrons.

Fluorine the lightest halogen and exists as a highly toxic pale yellow
diatomic gas at standard temperatures and pressures.

Fluorine condenses into a bright yellow liquid at −188 degrees celcius

Fluorine has two solid forms, α- and β-fluorine.

Fluorine is the most electronegative element.

Fluorine has a high magnetogyric ratio.
and exceptional sensitivity to magnetic fields.

Fluorine is extremely reactive.
Almost all other elements, including some noble gases, form compounds with fluorine.

Moissan's method is used to produce industrial amounts of fluorine.

Uses:
 Fluoride in dental care.
 Fluorosurfactant treated fabrics are often hydrophobic.
 Compounds of fluorine are widely used in steel-making and aluminium-refining.
 And it's used in the chemical industry.

Dangers:
 Elemental fluorine is highly toxic to living organisms