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

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Both the statements are true

Both the statements are false

I is false and II is true

I is true and II is falseFrom 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,therfore size increases largely from B to Al.

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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