Q.

Among elements with the following electronic configurations, the one with the largest radius is

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a

1s2 2s2 2p6 3s2

b

1s2 2s2 2p6 3s2 3p1

c

1s2 2s2 2p6 3s2 3p3

d

1s2 2s2 2p6 3s2 3p5

answer is A.

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Detailed Solution

1s2 2s2 2p6 3s2 , it is metal, belong to s-block and LHS to RHS the atomic size decreases.
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Among elements with the following electronic configurations, the one with the largest radius is