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fluorine consists of just one isotope on earth, 19F, which has an exact mass of 18.998403...

fluorine consists of just one isotope on earth, 19F, which has an exact mass of 18.998403 u (including the electrons). the mass of one neutron is 1.008665 u; the mass of one proton is 1.007276; and the mass of one electron is 0.000549 u. calculate the mass defect in atomic mass unit and in kilograms for one 19F atom. 1 u = 1.660539x10-27kg

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