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The first nuclear reaction ever observed was by ernest Rutherford in 1919. It was triggered by alpha particles incident on an isotope of nitrogen `._(7)^(14)` N. He observed a proton was emitted along with another element x. Let us assume that `._(7)^(14)` N nucleus was initially stationary. For this reaction to occur, alpha-particle must touch the nitrogen nucleus. The distance between their centres at this moment is d. For this problem, we will neglect the effect of outer electrons in `._(7)^(14)` N. Symbols have their usual meanings. X is an isotope ofA. NitrogenB. OxygenC. FluorineD. Carbon

Answer» Correct Answer - B
`._(2)^(4)He+._(7)^(14)Nrightarrow._(1)^(1)p+._(8)^(17)X`


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