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5 March, 18:22

If a potassium atom has an atomic number of 19 and a mass number of 39, how many protons, electrons, and neutrons are in the atom?

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  1. 5 March, 21:26
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    Proton number = atomic number = 19

    electron number = proton number | for a neutral atom = 19

    neutrons = mass number-atomic number

    = 39-19 = 20
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