The atomic number of an element is defined as the number of ___________ in an atom of that element.A  protonsB  neutronsC  electronsD  nucleons*1 pointABCD

The atomic number of an element is defined as the number of protons in an atom of that element. Therefore, the correct answer is:

Final Answer

A protons

Explanation

Each element on the periodic table is identified by its atomic number, which is fundamental in determining the structure and identity of the element. The atomic number not only indicates the number of protons present in the nucleus of an atom but also, in a neutral atom, it corresponds to the number of electrons surrounding the nucleus.

Neutrons do not influence the atomic number; however, they do contribute to the atomic mass of the element and the isotope variations of that element. Nucleons denote both protons and neutrons collectively, which makes them relevant for the overall atomic mass but not for the atomic number specifically. Thus, the concept of atomic number serves as a crucial aspect of understanding chemical behavior, electron configuration, and the organization of elements in the periodic table.