Question

an element is determined by the number of _______ in its nucleus (also known as its atomic number). options: neutrons, electrons, protons

Explanation:

In Chemistry (a subfield of Natural Science), the atomic number of an element is defined as the number of protons in the nucleus of an atom. Neutrons affect the isotope, and electrons are involved in chemical bonding but not in defining the element's identity. So the correct option is protons.

Answer:

C. protons (assuming the options are labeled as A. neutrons, B. electrons, C. protons; if labels are different, adjust to the correct identifier with "protons")