Answer: 10 neutrons.
Explanation:
· Atomic number(Z) of fluorine = 9
· Atomic mass (A) of fluorine = 19
· Number of protons = 9
· Number of electrons = 9
· Number of neutrons = Atomic mass(A) - atomic number(Z)
Therefore, number of neutrons = 19 – 9 = 10 neutrons
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