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

Responses

all particles

all particles

electrons

electrons

neutrons

neutrons

protons

3 answers

Two atoms that are isotopes of one another must have a different number of neutrons. Isotopes are defined as atoms of the same element that have the same number of protons but different numbers of neutrons.

choose one of the answer choices above

The correct answer is neutrons.