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Which one of the following pairs constitutes isotones ?

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Which one of the following pairs constitutes isotones ?
A. `._(6)C^(13) and ._(6)C^(14)`
B. `._(6)C^(13) and ._(7)N^(14)`
C. `._(7)N^(14) and ._(9)F^(19)`
D. `._(7)N^(14) and ._(7)N^(15)`
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Correct Answer - B
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