Answer:
Isotones contain same number of neutrons. Let?s check no. of neutrons in each set.
From the above charts it is clear that \[_{18}A{{r}^{40}}\] \[_{20}C{{a}^{42}}\] and \[_{21}S{{c}^{43}}\] are isotones. a) Atom No. of neutrons \[_{6}{{C}^{12}}\] \[12-6=6\] \[_{6}{{C}^{13}}\] \[13-6=7\] \[_{6}{{C}^{14}}\] \[14-6=8\] b) Atom No. of neutrons \[_{18}A{{r}^{40}}\] \[40-18=22\] \[_{20}C{{a}^{42}}\] \[42-20=22\] \[_{21}S{{c}^{43}}\] \[43-21=22\] c) Atom No. of neutrons \[_{18}A{{r}^{40}}\] \[40-18=22\] \[_{20}C{{a}^{40}}\] \[40-20=20\] \[_{21}S{{c}^{41}}\] \[41-21=20\] d) Atom No. of neutrons \[_{7}{{N}^{14}}\] \[14-7=7\] \[_{8}{{O}^{16}}\] \[16-8=8\] \[_{9}{{F}^{18}}\] \[18-9=9\]
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