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

1. ${ }_{34} \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}$
2. ${ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Ga}^{86}$
3. ${ }_{42} \mathrm{Se}^{92},{ }_{40} \mathrm{Ga}^{92}$
4. ${ }_{20} \mathrm{Se}^{40},{ }_{16} \mathrm{Ga}^{12}$

Solution

Asked in: NEET 2005

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