Question

this subatomic particle always identifies the identity (name) of the element. neutron amu electron proton

Explanation:

The number of protons in an atom's nucleus, known as the atomic number, determines the element's identity. Different elements have unique numbers of protons. Neutrons affect isotopes and electrons are involved in chemical bonding but do not define the element. 'amu' is a unit of mass, not a sub - atomic particle for identifying elements.

Answer:

Proton