Question

The triad of nuclei which is isotonic is

• A. ${}_6^{14}C,{}_7^{15}N,{}_9^{17}F$
• B. ${}_6^{12}C,{}_7^{14}N,{}_9^{19}F$
• C. ${}_6^{14}C,{}_7^{14}N,{}_9^{17}F$
• D. ${}_6^{14}C,{}^{14}{}_{7}N,{}_9^{19}F$

Answer 1

Answer: (A)

Isotonic species - same number of neutrons. Number of neutrons in

${}_6^{14}C,{}^{15}N,{}^{17}F=8$