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Britannica Sources used in this answer

Which stable isotope of fluorine occurs naturally?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
A labeled diagram of the periodic table entry for fluorine, showing its atomic number 9, symbol F, atomic weight 18.998, electron configuration, and indicating it is a halogen and a gas at room temperature.
fluorine Properties of fluorine.

The only stable isotope of fluorine that occurs naturally is fluorine-19.12