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Atoms `._(7)X^(A),._(8)Y^(B)` and `._(9)Z^(17)` are such that `._(8)Y` is an isobar of `._(7)X` and atom `._(9)Z^(17)` is isotone of `._(8)Y`. Mass no

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Atoms `._(7)X^(A),._(8)Y^(B)` and `._(9)Z^(17)` are such that `._(8)Y` is an isobar of `._(7)X` and atom `._(9)Z^(17)` is isotone of `._(8)Y`. Mass no. of `X` and no of neutrons in `Y` are respectively `:`
A. 8,8
B. 17,7
C. 9,8
D. 16,8
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Correct Answer - D
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