Fluorine is the most abundant halogen in the earth's crust and the thirteenth most abundant among all elements. The fluorine atom has a molar weight of 18.998, a van der Waals radius of 1.47 Å and is isosterically similar to a hydroxyl group. It has an electronegativity value of 4.0, which causes the molecule to be very reactive. Because of its high reactivity, fluorine is rarely found in pure form, but exits in various compounds or as the monovalent anion fluoride.

Fluoride exposure in the Chiang Mai Basin, Thailand, poses health risks due to its high reactivity and potential for causing dental fluorosis.

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Health Risks of Fluoride in the Chiang Mai Basin, Thailand

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