Question

which of the following defines the atomic number of an atom? (1 point)
o the number of valence electrons
o the number of electrons, protons, and neutrons
o the number of neutrons
o the number of protons

Explanation:

The atomic number of an atom is defined as the number of protons in its nucleus. This is a fundamental concept in chemistry. Valence electrons are outer - shell electrons involved in bonding, the sum of electrons, protons and neutrons is related to atomic mass, and the number of neutrons is not the atomic number.

Answer:

the number of protons