Question

question 4
the chemical element of an atom is determined by the number of __________ it contains.
photons
neutrons
protons
electrons
gravitons

Explanation:

The atomic number, which defines a chemical element, is equal to the number of protons in an atom's nucleus. Different elements have distinct numbers of protons. Neutrons affect isotopes, electrons are involved in chemical bonding, photons are related to light, and gravitons are hypothetical particles related to gravity and not relevant here.

Answer:

C. protons