Question

the atomic number of an atom is multiple choice the number of protons in the atom. the number of neutrons in the atom. the number of protons plus the number of electrons in the atom. the number of protons plus the number of neutrons in the atom. none of these choices are correct.

Explanation:

The atomic number of an atom is defined as the number of protons in its nucleus. This is a fundamental concept in chemistry. Neutrons are not part of the definition of the atomic number. The sum of protons and electrons or protons and neutrons does not define the atomic number.

Answer:

the number of protons in the atom.