First slide

Atomic and physical properties

Question

The discontinuity in the ionisation enthalpy values observed between

Easy

A

Al and Ga
B

In and Tl
C

B and Al
D

Both (a) and (b)

Solution

The ionisation enthalpy values as expected from the general trends, do not decrease smoothly down the group. The decrease from B to Al is associated with increase in size. The observed discontinuity in the ionisation enthalpy values between Al and Ga, and between In and Tl are due to the inability of d-and f-electrons, which have low screening effect, to compensate the increase in nuclear charge.

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