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The atomic number of fluorine is 9 and its atomic number is 19. What is the number of neutrons present in its nucleus?

Flourine has 10 neutrons present in the nucleus.
And by the way, its atomic number is not 19 but its atomic mass is 19.
Hope it helps!!!!!!!!
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the atomic number of fluorine is 9 and its mass number is 19 . number of neutrons in the atom is mass number -  atomic number = 19-9=10 
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atomic number is the number of protons. 
therefore, no. of protons= 9
mass number is the number of protons and neutrons.
mass no.= 19

no.of neutrons = mass no. -no.of protons
                        = 19-9
                        = 10 neutrons
 
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