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(C) The discovery of the atomic nucleus was made by $Ernest \ Rutherford$ in $1911$ through his famous $\alpha$-particle scattering experiment, also k

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Rutherford

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(C) The discovery of the atomic nucleus was made by $Ernest \ Rutherford$ in $1911$ through his famous $\alpha$-particle scattering experiment, also known as the $Geiger-Marsden$ experiment.In this experiment, a thin gold foil was bombarded with $\alpha$-particles, and the observation that some particles were deflected at large angles led to the conclusion that the positive charge and most of the mass of the atom are concentrated in a very small region called the nucleus.

The discovery of the nucleus of an atom was due to the experiment carried out by

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