I was going through some ionisation energy data, where I came across the following:
Ionisation energy order for Group 13 and 14:
B > Al ≈ Ga > In < Tl
C > Si > Ge > Sn < Pb
What could be the possible reason for reversal in trend after fourth period? I'm not sure how accurately it can be attributed to screening effect.
An explanation would be great.