General Science Chemistry Basic Concepts of Chemistry

Which of the following pairs represents Isobars?

1
\(\rm {_2^3He} \ and \ {_2^4He}\)
2
\(\rm {_{12}^{24}Mg} \ and \ {_{12}^{25}Mg}\)
3
\(\rm {_{19}^{40}K} \ and \ {_{20}^{40}}Ca\)
4
\(\rm {_{19}^{40}K} \ and \ {_{19}^{39}K}\)
5
None of the above

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