The atomic number of an element is the total number of which particles in the nucleus? and electrons

Protons (and electrons for a neutral atom)

Explanation:

- The atomic number (usually labelled with Z) of an atom corresponds to the number of protons in the nucleus of an atom.

- If we are considering a neutral atom, then its number of electrons is equal to the number of protons, so the atomic number also corresponds to the number of electrons.

- Instead, the mass number of an atom (usually labelled with A) corresponds to the sum of the protons and the neutrons in the nucleus.

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