How do you know nucleus is compared very small as compared to size of atom
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because size of nucleus is very small order as compare to radius of atom
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Rutherford observed that when a-particles were bombarded on a very thin foil they bounced back. But the number of a-particles bouncing back got doubled when he doubled the thickness of gold foil. Then he concluded that the area of nucleus is very small in comparison to the total area of the atom.
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