Question

which of the following sets represents a pair of isotopes?

Answer 1

Hello @laysjaaa !
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Answer 2

It seems that your question has a few options. Could you post them too?
We can't help you with questions that provide insufficient information.

Answer 3

when you post your options, isotopes are atoms of the same element with the same number of protons but different number of neutrons. . For example, there are three kinds of carbon atom 12C, 13C and 14C. They all have the same number of protons, but the number of neutrons varies.
isotopes Protons neutrons mass number
C-12 6 6 12
C-13 6 7 13
C-14 6 8 14