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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.

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    $\begingroup$ d-orbital contraction. $\endgroup$ – Teoc Feb 3 '18 at 8:53
  • $\begingroup$ @Cyclohexanol. You meant the lanthanide contraction I guess? $\endgroup$ – Gaurang Tandon Feb 3 '18 at 10:55

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