Which of the following pair of nuclei are isobars of the element? (a) ₁³H and ₂³He (b) ₈₀¹⁹⁸Hg and ₇₉¹⁹⁷Au (c) ₁²H and ₁³H (d) ₉₂²³⁶U and ₉₂²³⁸U

Answer: (a). Isobars have the same mass number A but different Z. ₁³H and ₂³He: both A = 3, Z = 1 and 2. (c) and (d) are isotopes; (b) has different A. So the answer is (a).

Which of the following pair of nuclei are isobars of the element? | JEE Main 2026 (23 Jan, Shift 2)

Q1JEE Main 2026 · 23 JAN · SHIFT 2Easy

Nucleus: Composition, Size & Nuclear Force

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

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Answer: (a)

Isobars have the same mass number $A$ but different $Z$ .
${}_{1}^{3}\text{H}$ and ${}_{2}^{3}\text{He}$ : both $A = 3$ , $Z = 1$ and $2$ .
(c) and (d) are isotopes; (b) has different $A$ .
So the answer is (a).

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