When \( \mathrm{a}_{4} \mathrm{Be}^{9} \) atom is bombarded with \( \alpha \)-particles, one of ...

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When \( \mathrm{a}_{4} \mathrm{Be}^{9} \) atom is bombarded with \( \alpha \)-particles, one of the product of nuclear transmutation is \( { }_{6} \mathrm{C}^{12} \). The other is
(A) \( -1 e^{0} \)
(B) \( { }_{1} \mathrm{H}^{1} \)
(C) \( { }_{1} \mathrm{D}^{2} \)
(D) \( { }_{0} n^{1} \)
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