Explain the variation of atomic radii in group 13 elements.

1.	Explain the variation of atomic radii in group 13 elements.
Answer» Solution :Aluminium has a sharp INCREASE in size from that of BORON. This is due to greater SCREENING effect produced by the 8 electrons of L-shell in aluminium. Gallium has a smaller atomic radius due to completely FILLED 3d subshell which cannot shield the outermost electrons from the nuclear FORCE of attraction.

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