Isotopes of an element have the same number ofA. protons and electrons.B. protons and neutrons.C. neutrons and electrons.D. protons, neutrons and electrons

Isotopes of an element have the same number of protons and electrons. So, the correct answer is A. protons and electrons.

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.

The number of protons determines the element, and is known as the atomic number. For example, all carbon atoms have 6 protons. Electrons are involved in chemical reactions and bond formation, and in a neutral atom, the number of electrons equals the number of protons. Therefore, isotopes of an element have the same number of protons and electrons.

However, isotopes have different numbers of neutrons. This is what makes them isotopes. So, they do not have the same number of protons and neutrons (option B), or neutrons and electrons (option C).

Option D is also incorrect because, as explained, while isotopes of an element have the same number of protons and electrons, they have different numbers of neutrons.