One molecule of fluorine contains 18 protons. If the mass number of a fluorine atom...
One molecule of fluorine contains 18 protons. If the mass number of a fluorine atom...
One molecule of fluorine contains 18 protons. If the mass number of a fluorine atom is 19, how many neutron are there in one atom of fluorine?
A. 18
B. 9
C. 10
D. 20?
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