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Atoms .(7)^(A)X, (8)^(B)Y " and " (9)^(1...

Atoms `._(7)^(A)X, _(8)^(B)Y " and " _(9)^(17)Z` are such that `._(8)Y` is an isobar of `_(7)X` and `._(9)^(17)Z` 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`

Text Solution

Verified by Experts

The correct Answer is:
4
Isotones have same no. of neutrons.
`17-9=B-8`
`B=16`
Isobars have same mass no
`A=B=16`
no. of neutrons `16-8=8`
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