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20-09-2018
Chemistry

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if an atom has 4 protons, 5 neutrons, and 4 electrons, what is the mass number of this atom? How do you know??

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Celeene Celeene

20-09-2018

Mass number is no of protons and neutrons so it will be 5 and 4 which will give you 9 you'll know because once you get the equation you'll get the answer

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