The nuclei of which one of the following pairs are isotones:
1. | \(34 \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}\) | 2. | \({ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Sr}^{86}\) |
3. | \({ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}\) | 4. | \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\) |
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