A) \[_{2}^{3}He\] and \[_{2}^{4}He\]
B) \[_{12}^{24}Mg\] and \[_{12}^{25}Mg\]
C) \[_{19}^{40}K\] and \[_{20}^{40}Ca\]
D) \[_{19}^{39}K\] and \[_{19}^{40}K\]
Correct Answer: C
Solution :
Atoms of different elements having different atomic no. but same mass no. are called isobars.
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