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# Arrange the following elements in increasing order of their atomic radii.

**(a)** Li, Be, F, N

**(b)** Cl, At, Br I

**(a) F < N < Be < Li**

These elements are in the same period and atomic radii decrease from left to right, so the increasing order of their atomic radii is: F, N, Be, Li

**(b) CI < Br < I < At**

These elements are in the same group and atomic radii increase from top to bottom, so the increasing order of their atomic radii is: Cl, Br, I, At.

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