A) A and B are isobars
B) A and C are isotones
C) A and B are isotopes
D) A and D are isotopes
Correct Answer: D
Solution :
\[_{x}^{y}A\xrightarrow{-\alpha }_{x-2}^{y-4}\xrightarrow{-\beta }_{x-2}^{y-4}\xrightarrow{-\beta }_{x}^{y-4}D\] Thus, A and D are isotopes as they have same atomic number but different mass numbers.
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