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Q.

            Statement (A) : The atomic radii in a group top to bottom increases.

            Statement (B) : The atomic radii in a period left to right decreases.

            Statement (C) : C4, Si+4 are iso electronic species.

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a

A and B are correct but C is incorrect

b

All the above statements are correct

c

A and B are incorrect but C is correct

d

All the above statements are incorrect

answer is A.

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Detailed Solution

In a group from top to bottom atomic radii increases. This is due to new shells are added for the atom. But in a period, from left to right atomic size gradually decreases. Due to increase the effective nuclear charge on valence shell. Both C4 and Si+4 have same no. of electrons.

C4 ion = 6 + 4 = 10 eSi+4 ion = 144 = 10 e

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