Isotopes of an element differ in their .

Neutrons

Explanation:

Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.

the correct answer should be false

{apex}

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )