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Explain the variation of atomic radii in...

Explain the variation of atomic radii in group 13 elements.

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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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