Statement I : The increase in the atomic radius from B to Al is more than that of consecutive elements of the same group.
Statement II : Electrons in the penultimate shell of aluminum have a greater screening effect.

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if statement I is correct but statement II is incorrect.

if statement I is incorrect, but statement II is correct.

if both statement I and statement II are correct.

if both statement I and statement II are incorrect.

answer is A.

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Detailed Solution

From B to Al as the number of inner shell s and p orbital electrons increases , shielding effect increases. Since s and p orbital electrons acts as strong screens hence they can protect the valency electrons from the nucleus effectively, so nuclear forces of attractions on valency electrons decreases , therefore size increases largely from B to Al.

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