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The nuclei of which one of the following pairs of nuclei are isobars?

1. 54/26 Fe^(34), 31/15 Ga^(71)
2. 38/18 Sr^(84), 38/18 Sr^(86)
3. 42/20 Mo^(92), 40/20 Zr^(92)
4. 20/10 Ca^(40), 16/8 S^(32)

Correct answer: 54/26 Fe^(34), 31/15 Ga^(71)

Solution

Isobars are nuclei with the same mass number but different atomic numbers. In option A, both nuclei have the same mass number (A = 71) but different atomic numbers (26 and 15), making them isobars.

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