Iodine is a glossy, black solid, while fluorine, the lightest halogen, is a pale yellow gas. The rarest and heaviest halogen, astatine, is found in uranium ores.
Of all the elements, fluorine is the most electronegative and chemically reactive. Pale yellow-green in color, it is a single-valent poisonous gaseous halogen. The majority of other elements easily react with fluorine to create new compounds, including the noble gases krypton, xenon, and radon.
Fluorine is required for both the production of nuclear power plant radioactive material and the insulation of electric towers. Hydrogen fluoride, a chemical with a fluorine atom, is used to etch glass. Fluorine is used to make plastics, much like Teflon, and is essential for dental health.
It is just one of a select few nonmetals and nonmetals that can create diatomic molecules (F2).
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