$[1993$ ]
(a) ${ }_2^4 \mathrm{He}$
(b) ${ }_3^7 \mathrm{Li}$
(c) ${ }_{56}^{141} \mathrm{Ba}$
(d) ${ }_{92}^{235} \mathrm{U}$
Correct Answer: 2.(b)
Solution: (b)
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