Final answer:
The atomic number of copper, representing the number of protons in its nucleus, is 29.
Explanation:
The atomic number of an element is equal to the number of protons in the nucleus of an atom. For copper, which has 29 protons, the atomic number is 29. This means that in a neutral copper atom, there are also 29 electrons surrounding the nucleus in energy levels or shells. The atom can be represented using the Bohr model, which shows how electrons are arranged in different energy levels.
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