Why completely filled d orbital causes more shielding effect?
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The d-block contraction (sometimes called scandide contraction) is a term used in chemistry to describe the effect of having full d orbitals on the period 4 elements. The elements in question areGa, Ge, As, Se, Br, and Kr. Their electronic configurations include completely filled d orbitals (d10). d-block contraction is best illustrated by comparing some properties of the group 13 elements to highlight the effect on gallium.
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