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Question

Which of the following is the correct order for the increasing atomic radius?

A
Al<Ga<Be<Li
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B
Be<Ga<Al<Li
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C
Al<Ga<Li<Be
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D
Al<Be<Ga<Li
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Solution

The correct option is B Be<Ga<Al<Li
Atomic radius increases down a group and decreases as we move from left to right across a period. So, from Li to Be atomic radius decreases.
But due to poor shielding of d-electrons, atomic radius of Ga is smaller than that of Al.

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