First slide

Atomic and physical properties

Question

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

Easy

A

Both the statements are true
B

Both the statements are false
C

I is false and II is true
D

I is true and II is false

Solution

B - 1s² 2s² 2p¹
Al - 1s² 2s² 2p⁶3s²3p¹
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,therfore size increases largely from B to Al.

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