Which particles in an atom determine an element's atomic number and identity proton
electron
neutron

protons

Explanation:

in middle school I learned an acronym

A = Atomic Number

P = Protons

E = Electrons

we learned that these are all the same value however in chemistry we learn that isotopes have different amounts of electrons so the answer would be protons

proton

Explanation:

the number of protons determines the atomic number and the identity of an element.  It also determines the number of electrons that surround the nucleus.

the nucleus determines the chemical characteristics and behaviour of the element.

the neutron ensures the stability of the nucleus in the atom

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