Q13 / 160 · TS EAMCET 2023 (14 May Shift 2) · Chemistry

The atomic radius of gallium is less than that of aluminium. This is due to

A
Greater shielding power of s-electrons of gallium atom
B
poor shielding power of s-electrons of gallium
Correct answer
C
Poor shielding power of d-electrons of gallium
D
Greater shielding power of d-electrons of gallium

Solution

Due to poor shielding effect of d-electrons of gailium, it leads to increase in effective nuclear charge which inturn leads to decrease in the radius of gallium as compared to aluminium.

Hence, the correct answer is option: 'C'.

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