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The triad of nuclei that is isotonic is...

The triad of nuclei that is isotonic is

A

`._6C^14 , ._7N^15 , ._9F^17`

B

`._6C^12 , ._7N^14 , ._9F^19`

C

`._6C^14 , ._7N^14 , ._9F^17`

D

`._6C^14 , ._7N^14 , ._9F^19`

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