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PhysicsJEE Main 23 Jan 2026, Shift 2·Q12·MCQ·Easy

Nuclei · Nuclear structure

Which of the following pair of nuclei are isobars of the element?
  1. (1)12H{}^{2}_{1}\mathrm{H} and 13H{}^{3}_{1}\mathrm{H}
  2. (2)92236U{}^{236}_{92}\mathrm{U} and 92238U{}^{238}_{92}\mathrm{U}
  3. (3)80198Hg{}^{198}_{80}\mathrm{Hg} and 79197Au{}^{197}_{79}\mathrm{Au}
  4. (4)13H{}^{3}_{1}\mathrm{H} and 23He{}^{3}_{2}\mathrm{He}
We corrected a printing error in the original paper

Source printed option (4) as “13H{}^{3}_{1}\mathrm{H} and 23H{}^{3}_{2}\mathrm{H}”.

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