how rutherford proved that positively charged particles are present in the nucleus of atom

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Solution

In Rutherford's experiment, when Î±-particles were bombarded a thin foil of metal as Gold nearly 100mm thick, then some of the Î±-particles were deflected back it means they must got striked to some heavy particles. These heavy particles were called as nucleus. And Î±-particles are positively charged and if these are reflected back which shows that there must be some positive charge present inside the nucleus.

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