Which of the following pair of nuclides is an example of isotones?

Which of the following pair of nuclides is an example of isotones?
  1. ${ }_{17}^{35} \mathrm{Cl},{ }_{17}^{37} \mathrm{Cl}$
  2. ${ }_{18}^{40} \mathrm{Ar},{ }_{19}^{40} \mathrm{~K}$
  3. ${ }_6^{13} \mathrm{C},{ }_5^{11} \mathrm{~B}$
  4. ${ }_6^{12} \mathrm{C},{ }_5^{11} \mathrm{~B}$

Solution

The atoms of different elements having same number of neutrons in their nuclei are called isotones. ${ }_6^{12} \mathrm{C}$ and ${ }_5^{11} \mathrm{~B}$ are isotones.

Asked in: MHT CET 2023 (13 May Shift 1)

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