While we compare Aluminium and Gallium in terms of atomic radius, Gallium has smaller radius (because of d-orbital). Why doesn't this happens in terms of Silicon and Germanium? why does germanium has higher atomic radius?
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Explanation:- Gallium has smaller atomic radius than aluminium because the d orbital which is highly diffused offers poor shielding effect which results in increased nuclear charge. Due to increased charge by nucleus, outer electrons get attracted, decreasing the radius.
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