Assertion :Elements in the same group show same valency. Reason: As the outermost electron is added in the same valence shell as they share the same electronic configuration.

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 C Assertion is correct but Reason is incorrect
The valency of an element is determined by the number of valence electron in the outermost shell of an atom. Elements in same group show same valency because they have same number of electrons in the outermost shell i.e. Valence shell.
Hence, Assertion is correct but Reason is incorrect.
Option C is correct.

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