Which of the following triads represents isotones?

_{6}^{12} C,_{6}^{13} C,_{6}^{14} C

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_{18}^{40} A r,_{20}^{42} C a,_{21}^{43} S e

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_{18}^{40} A r,_{20}^{40} C a,_{21}^{41} S e

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_{7}^{14} N,_{8}^{16} O,_{9}^{18} F

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Solution

The correct option is B $_{18}^{40} A r,_{20}^{42} C a,_{21}^{43} S e$
Correct option is B
Isotones are those which have different proton number but same number of neutrons.
Mass number= no. of proton+no. of neutrons
No of neutrons ( Ar (mass no=40)=40-18=22
No of neutrons ( Ca (mass no=40)=42-20=22
No of neutrons ( Se (mass no=43)=43-21=22

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