Answer and explanation:
What particles are inside the nucleus of an atom? Protons and neutrons. Protons have a charge of plus one while neutrons have no charge (neutral). Therefore, the charge of nucleus of copper atom must be equal to the charge of the protons inside the nucleus. How many protons does Copper have? The number of protons is equal to atomic number which we can find by looking at the periodic table. This number is located on the bottom left corner of each symbol. If we look at the periodic table, we will see that its atomic number is 29. Therefore the charge of the nucleus is +29, choice (3).
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