Duration: 4:50

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Directions \( \quad \) In the following
questions, an Assertion (A) is followed by a
corresponding Reason (R). Use the following keys to
choose the appropriate answer.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of A.
(b) Both A and R are correct; and R is not the correct explanation of A.
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) The elements having \( 1 s^{2}, 2 s^{2}, 2 p^{6} \), \( 3 s^{2} \) and \( 1 s^{2}, 2 s^{2} \) configuration belong to same period.
Reason (R) Both have same outermost electronic configuration.
\( \mathrm{P} \)
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