Reduction in effective nuclear charge due to the filling of 3d sub-shell
Explanation:
Although, according to the trend in the periodic table, the size of shell go on increasing but an anomaly in Group 13 s observed in case of Aluminium and Gallium. Gallium should have a bigger shell configuration according to the trend but it is small as compared due to the first filling of 3d sub-shell by electron as we can see from their electronic configurations as:
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