Question

Two atoms that are isotopes of one another must have different number of what?

A: Protons

B: Neutrons

C: Electrons

D: All Particles

Answer 1

Just to add its shortly i chose b and got it correct

Step-by-step explanation:

Answer 2

For many of the chemical elements there are several known isotopes. Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.