Which of the following pair of nuclei are isobars of the element ?

Question

G1 Physics · Accepted Answer

Isobars are nuclei having the same mass number A but different atomic numbers Z. Option A: ²₁H and ³₁H have different mass numbers. Option B: ²³⁶₉₂U and ²³⁸₉₂U also have different mass numbers. Option C: ¹⁹⁸₈₀Hg and ¹⁹⁷₇₉Au have different mass numbers. Option D: ³₁H and ³₂He both have mass number 3 but different atomic numbers. Therefore they are isobars. Correct option: D.