First slide

Atomic and physical properties

Question

The correct order of ionization potential [IP₁] among the IIIA group elements is

Easy

A

B > Ga > Al > Tl > In
B

B > Tl > Al > Ga > In
C

B > Tl > Al > Ga = In
D

B > Tl > Ga > Al > In

Solution

I.E.Order: B >Tl >Ga > Al > In
Atomic radius order :Tl~In >Al > Ga > B
OR
B < Ga < Al < In ~ Tl
Ionisation energy order of IIIA group elements is,B >Tl >Ga > Al > In
On moving down the group ,the ionisation energy decreases,this is true for B and Al.The ionisation energy of Ga is unexpectedly higher than that of Al.
This is due to poor shielding effect by completely filled d-orbitals in the inner shell of Ga,hence the Ga valency electrons are strongly held by nucleus therefore removal of electron from Ga is highly difficult compared to Al .
A similar increase is observed from In to Tl due to presence of 14 f-orbital electrons in the inner shell of Tl which have poor shielding effect .

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App