The triad of nuclei that is isotonic is:

Options

A. `._(6)^(14)C, ._(7)^(15)N, ._(9)^(17)F`
B. `._(6)^(14)N, ._(9)^(19)F`
C. `._(6)^(14)C, ._(7)^(14)N, ._(9)^(17)F`
D. `._(6)^(14)C, ._(7)^(14)N, ._(9)^(19)F`

Answer

A

Explanation

The atoms having same number of neutrons are called isotones. `._(6)^(14)C, ._(7)^(15)N, and ._(9)^(17)F` have same number of neutrons. All of them have 8 neutrons `(Z-A=8)`