fluorine

From Wiktionary
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The Simple English Wikipedia has an article on:

oxygen 9 neon

Pronunciation[change]

Noun[change]

Singular
fluorine

Plural
none

  1. Fluorine is a yellow gas that has an atomic number of 9 and the symbol F.
    Fluorine reacts very easily.
    Fluoride toothpaste contains a compound of fluorine.