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

B - 1s2 2s2 2p1Al - 1s2 2s2 2p6 3s23p1From 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.