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QUESTION

# A copper atom with 34 neutrons. What is the atomic symbol? Express your answer as an isotope.

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?