A) \[_{32}^{78}Ge,_{33}^{77}As,,_{31}^{74}Ga\]
B) \[_{18}^{40}Ar,_{19}^{40}K,_{20}^{40}Ca\]
C) \[_{92}^{233}U,_{90}^{232}Th,_{94}^{239}Pu\]
D) \[_{6}^{13}C,_{2}^{12}C,_{7}^{14}N\]
E) \[_{6}^{14}C,_{8}^{16}C,_{7}^{15}N\]
Correct Answer: E
Solution :
\[_{6}^{14}C,_{8}^{16}O,_{7}^{15}N=\]isotonic triad Isotonic = same number of neutron. All species contain 8 neutrons.
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