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Q.

Which of the following are examples of isotones?

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a

${Na}_{11}^{23}, {Mg}_{12}^{24}$

b

${Th}_{90}^{234}, U_{92}^{238}$

c

${Ar}_{18}^{40}, {Ca}_{20}^{40}$

d

$C_{6}^{14}, N_{7}^{14}$

answer is D.

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Detailed Solution

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Example of isotones is ${Na}_{11}^{23}, {Mg}_{12}^{24}$ . Isotones are the atoms of different elements which have the same number of neutrons.

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