Assertion :Sodium and chlorine have different chemical properties. Reason: For the highest occupied energy level, sodium and chlorine both have different principal quantum numbers.

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
Assertion
Sodium and chlorine have chemical properties different as they have different valence shell electronic configuration.
Reason
For the highest occupied energy level sodium and chlorine both have same principal quantum number $n = 3$ .
Hence, Assertion is correct but Reason is incorrect.

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