Isotopes of the same element have different?Aatomic numbersBnumbers of neutronsCnumbers of electronsDnumbers of protons

Isotopes of the same element have different numbers of neutrons. So, the correct answer is B.

Here's why:

Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.

A. Atomic numbers - Incorrect. The atomic number is equal to the number of protons in an atom's nucleus. All isotopes of a particular element have the same atomic number because they have the same number of protons.

B. Numbers of neutrons - Correct. Isotopes of the same element have different numbers of neutrons. This is what makes them isotopes.

C. Numbers of electrons - Incorrect. In a neutral atom, the number of electrons is equal to the number of protons. Since all isotopes of a particular element have the same number of protons, they also have the same number of electrons.

D. Numbers of protons - Incorrect. All isotopes of a particular element have the same number of protons. This is what makes them the same element.