Question

Isotopes of the same element have the same number of ________ and a different number of _____.

A.) Neutrons, protons
B.) Electrons, protons
C.) Protons, neutrons
D.) Protons, electrons

Answer 1

C.) Protons and neutrons. Isotopes have same atomic number but different atomic mass number.

Answer 2

C.) Protons, neutrons. Hope it helps :)