Assertion :In the present form of periodic table, the period number corresponds to the highest principal quantum number of the elements in the period.
Reason: Elements having similar outer electronic configurations in their atoms belong to same period.

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
Elements having similar outer electronic configurations in their atoms are arranged in vertical columns, called groups or families. For example, alkali metals with outer electronic configuration $n s^{1}$ belong to group IA and alkaline earth metals with outer electronic configuration $n s^{2}$ belong to group IIA

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