Two isotopes of the same element differ in their number of
Pick an answer
Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 79 (General Science): neutrons
Method
Isotopes share a proton count, which is what makes them the same element, but carry different numbers of neutrons and so different masses. Carbon-12 and carbon-14 are the familiar example.
Updated: November 2026
Raise your AFQT scoreFree for iPhone and Android
