Question

what subatomic particle always determines the identity of an atom? a protons b ions c neutrons d electrons

Explanation:

The number of protons in an atom's nucleus, known as the atomic number, uniquely identifies an element. Different elements have different numbers of protons. Ions are charged atoms or molecules, neutrons affect mass but not identity, and electrons are involved in chemical bonding but do not define the element.

Answer:

A. Protons