63. Isotopes of an element contain A.the same number of protons but different number of neutrons B.the same number of neutrons but different number of protons C.equal number of protons and electrons D.equal number of nucleons
Solution: Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
