fluorine

(uncountable) 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.
(countable) A single atom of this element.

atomic number 9

φθόριο

fluor

From Latin fluor (“flow”) + -ine. Coined by British chemist Humphry Davy in 1813.

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