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The fluoride compounds are usually colorless (if not attached to a red group). The alkali metal fluorides are water soluble hygroscopic fluorides of alkaline earth elements, especially calcium and barium are poorly soluble. Calcium fluoride is found in nature as fluorite (this mineral element and fluorides have received their name), the principal ore of this element. The oxygen difluoride (OF2) is the only compound with oxygen in the oxidation state 2. By the fact that fluoride can not be oxidized by other elements or compounds to elemental fluorine fluoride can stabilize higher oxidation numbers of elements. Fluoride compounds exterminate all microorganisms from digestivo.A long time can cause digestive problems and certain problems with the colon.

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