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An atom of Potassium has a mass number of 40 and an atomic number of 19.how many protons does it have?

Updated: 4/28/2022

Wiki User

∙ 9y ago

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The atomic number is the number of protons: 19.

number of neutrons = mass number - atomic number = 21.

The number of electrons is normally the same as the number of protons: 19

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∙ 9y ago

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An atom of Potassium has a mass number of 40 and an atomic number of 19.how many protons does it have?

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