noun🔗ShareThe 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."Because fluorine is so reactive, it is often used to create stronger compounds like those found in Teflon and some toothpastes. "elementchemistrysubstancesciencematerialChat with AIVocabulary GamePractice Reading
noun🔗ShareA single atom of this element."an octahedron of fluorines"elementchemistrysubstanceChat with AIVocabulary GamePractice Reading
