Assertion :Electron affinity of 4th period elements is less than that of 3rd period elements. Reason: Fourth period elements are larger than that of third period. Hence, accepting tendency of electrons will be less for fourth period because of large size that is because of addition of new shell.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Electron affinity is the energy released when one electron is added. Fourth period elements are larger than that of third period. Hence, accepting tendency of electrons will be less for fourth period because of large size due to addition of new shell. Hence, Electron affinity of 4th period elements is less than that of 3rd period elements.

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