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Q.

Atoms  7XA,8YB and 9Z17 are such that 8Y is an isobar of 7X and atom 9Z17 is isotone of ,Y. Mass no. of X and no. of neutrons in Y are respectively:

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a

8, 8

b

17, 7

c

9, 8

d

16, 8

answer is D.

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Detailed Solution

Isotones have same no. of neutron;17 - 9 = B - 8B = 16Isobars have same mass no.A-B = 16No. of neutrons 16 - 8 = 8
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Atoms  7XA,8YB and 9Z17 are such that 8Y is an isobar of 7X and atom 9Z17 is isotone of ,Y. Mass no. of X and no. of neutrons in Y are respectively: