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what is the mass number of an atom of potassium that has 20 neurons?

what is the mass number of an atom of potassium that has 20 neurons?

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Answer #1

For potassium, the atomic number,Z = 19

We know that Atomic number= no.of protons = 19

Given number of neutrons is 20

Atomic mass number= no. of protons + no. of neutrons

                               = 19 + 20

                               = 39

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