existence of neutrons in the nucleus – Discussion Forum

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Virat

Asked: September 11, 2026In: Class 9 Science

Choose the correct options and explain the reason for the correct and incorrect options in the context of Ernest Rutherford’s gold foil experiment: (i) The experiment clearly showed the existence of neutrons in the nucleus. (ii) The results disproved the plum pudding model and led to the idea of a nucleus at the centre of the atom. (iii) The large deflection of a few alpha particles indicated that most of the mass of the atom and positive charge are packed into a tiny centre. (iv) The way alpha particles were deflected showed that electrons move around the nucleus.

Options (ii) and (iii) are correct because alpha particle scattering revealed a tiny, dense, positive nucleus, disproving Thomson’s model. Options (i) and (iv) are incorrect because neutrons were discovered later and deflections did not trace electron movement.