Question Detail
Question
Which of the following best differentiates isotopes from one another?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Isotopes are atoms of the same element (same number of protons) that have different numbers of neutrons. This difference in neutron number gives them different mass numbers.
Hint
They are the same element, so the proton count is identical. What else in the nucleus can vary?