Assertion :In the Rutherford experiment, most of the $α$ particles passed without any deviation through the gold foil. Reason: The entire positive charge and nearly all of the mass of an atom is concentrated in the centre of the atom known as nucleus.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In Rutherford's gold leaf experiment, most of the particles passed through the foil, because most of the space inside the atom is empty and the entire positive charge and nearly all of the mass of an atom is concentrated in the nucleus.

Hence, option A is correct.

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