The chemical element (symbol F) with an atomic number of 9. It is the lightest of the halogens, a pale yellow-green, highly reactive gas that attacks all metals.
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A single atom of this element.
an octahedron of fluorines
Thesaurus
Synonyms
noun — a nonmetallic univalent element belonging to the halogens
Fluorine, chlorine, bromine, iodine and astatine are halogens.
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In their analysis of fast food packaging, researchers said 20 percent of paperboard samples, including boxes for french fries and pizza, contained fluorine.
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Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine are diatomic elements.