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Gallium has unexpectdly less atomic radi...

Gallium has unexpectdly less atomic radius than that of Al. Explain why ?

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On moving down the group, each successive element has one additional electron. Therefore, atomic radius is expected to increase. But atomic radius of Ga is less than that of AL. This is due to the presence of additional 10 d-electrons in Ga. These electrons offer poor screening effect for the outer electrons. The outer electrons are attracted towards the nucleus. Therefore, atomic radius of Ga is less than that of AL.
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