Which one of the following pairs constitutes isotones ?

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

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