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The copper nucleus contains ##29## protons, so we have ##""^63Cu##

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The copper nucleus contains ##29## protons, so we have ##""^63Cu##.

The superscript is the sum of protons and neutrons, massive nuclear particles with a positive or a neutral charge. How did I know that copper has 29 protons in its nucleus?

If I have a neutral atom of ##""^63Cu##, how many electrons are there?

IF there were 35 neutrons, how would I write the isotope?