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26 March, 19:33

What is the mass number of atoms with 5 protons and 7 neutrons?

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  1. 26 March, 21:24
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    The mass number of the atoms equal to the mass number of the nuclear.

    the mass number of nuclear equal to the sum of proton and neutron

    the mass of a proton nearly the same as a neutron

    the answer is 12
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