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. \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\)
Subtopic:  Number of Electron, Proton & Neutron |
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