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.