Sun September 15, 2013 By: Keshav Sultania

What do you mean by de energised and also explain tell why gallium size is smaller than aliminium

Expert Reply
Mon September 16, 2013
The Covalent radii of elements increase down a group. But in going from Al (Z =13, 3s, 3p orbitals) to Ga (Z = 31, 3d,4s, 4p) a block of ten 3d elements (Sc to Zn) intervenes and due to filling of n-1 3d sub-level, there ocuurs constriction in sise.
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