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I've read that in the 13th period, Ga has higher I.E. than Al because of the filling of the d-orbitals in Ga.

The text said they have low penetration,hence they don't shield well and the effective nuclear charge on the valence electrons increases.

But, shouldn't Germanium have a higher I.E. than Silicon by the same logic? Why doesn't it?

Also, why does Indium again have lower I.E. even though it has filled d-orbitals.

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