Answered

Atoms of different isotopes of the same element differ in their total number of
(1) electrons (3) protons
(2) neutrons (4) valence electrons



Answer :

Atoms of different isotopes of the same element differ in their total number of Neutrons.
saqrabdo16

Answer:

nuetrons

Explanation:

Changing the protons will change the element so that cant be it. not 1 and 4

3