Question

Isotopes of the same element do not have the same number of

• A. protons
• B. neutrons
• C. electrons

Answer 1

The correct option is B neutrons

Isotopes of the same element have the same atomic number but different mass numbers. Since the atomic number is the number of protons, these atoms will have the same number of protons.
The only difference arises in the number of neutrons which leads to a change in the mass number.

So, isotopes have a different number of neutrons.