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20-10-2017
Chemistry

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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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ejelonubenedict ejelonubenedict

20-10-2017

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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