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Physics
The triad of nuclei that is isotonic is
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Q. The triad of nuclei that is isotonic is
NTA Abhyas
NTA Abhyas 2022
A
${ }_1 H ^1$ and ${ }_1 H ^2$ and ${ }_1 H ^3$
B
${ }_{92}^{235} U ,{ }_{92}^{237} U$ and ${ }_{92}^{238} U$
C
${ }_{18}^{40} Ar ,{ }_{19}^{40} K$ and ${ }_{20}^{40} Ca$
D
${ }_6^{14} C ,{ }_7^{15} N$ and ${ }_8^{16} O$
Solution:
Since isotones have the same number of neutrons.
$_{6}^{14}C$ $,N=14-6$
$N=8$
$_{7}^{15}C$ $,N=15-7$
$=8$
$_{8}^{16}O$ $,N=16-8$
$=8$
For all N = 8