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there are 19 protons in a fluorine-19 atom. Ironic huh?

There are 9 protons in the fluorine 19 nucleus. There are 10 neutrons.

The atomic number of fluorine is 9, which is the number of protons in a nucleus. The isotope number is the total number of protons and neutrons. The number of neutrons is different between fluorine 18 and 19 (9 and 10 respectively). They both have 9 protons.

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12y ago

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