Question

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Why Size of Gallium is less than Aluminium?

Answer 1

hii friend...

Here is your answer...

The atomic radius of the Ga is less than Al because of poor screening effect. ... This makes the pronunced effect of nuclear charge (Zeff) and we find reduction in atomic radius of Gallium. It is thus diffused d-orbitals and their inability to shield the strong +ve charge which changes the trend of Atomic Radius..

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Answer 2

it is because of poor shielding effect and intervening of d and f orbital electrons