Question

why atomic radii of galium is less than aluminium?

Answer 1

The atomic radius of the Ga is less than Al because of poor screening effect.The atomic radius of Ga isslightly lesser than of Al because in going from Alto Ga, the electrons have alreadyoccupied 3d sub shell in Ga. The screening effect of these intervening electrons being poor, has less influence to decrease the effective nuclearcharge,therefore the electrons in Ga experience more forces of attractions towards nucleus to result in lower size of Ga than Al.


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