Question

quiz 3 build an atom
which subatomic particle determines the identity of an atom?
neutron
nucleus
electron
proton

Explanation:

The number of protons in an atom's nucleus, known as the atomic number, defines the element. Changing the number of protons changes the element's identity. Neutrons affect isotopes, electrons are involved in chemical bonding, and the nucleus is the central part containing protons and neutrons but it's the proton count that determines identity.

Answer:

Proton