Multiple choice If an element has three isotopes what does that mean? It has 3 forms with each having different number of electron It has 3 forms with each having different number of neutrons It has 3 forms with each having different number of protons It has 3 forms with each having different charges Reveal answer Fill a bubble to check yourself B Correct answer Explanation Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons, resulting in a different atomic mass.