Question

find the number of proton , neutron and electron in potassium atomic mass 40 and atomic no 19 .Two electron P and Q have mass number 40 .Their atoms contain 20 and 22 neutrons resp.Represnet their atomic composition using these symbols
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Answer 1

calcium is the answer hope it help u

Answer 2

Answer:

number of protons = Z = 19

number of electrons = Z = 19

number of neutrons = A - Z = 40 - 19 = 21

I think you want to say there elements P and Q naa dear ??