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Q.

Assertion (A) The elements having 1s2,2s2,2p6,3s2 and 1s2,2s2 configuration belong to same period.Reason (R) Both have same number of outermost shells.

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a

Both A and R are correct; R is the correct explanation of A.

b

Both A and R are correct; and R is not the correct explanation of A.

c

A is correct; R is incorrect.

d

R is correct; A is incorrect.

answer is D.

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Detailed Solution

2p6,3s2⟶ Belongs to 3rd period1s2,2s2⟶Belongs to 2ndperiodBoth have ns2,valence shell electronic configuration, so both have same number of outermost shell.
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Assertion (A) The elements having 1s2,2s2,2p6,3s2 and 1s2,2s2 configuration belong to same period.Reason (R) Both have same number of outermost shells.