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(D) Atomic radius decreases across a period from left to right due to an increase in effective nuclear charge.$(a)$ $Li, Be, N, F$ belong to the secon

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$(a) F $(b) Cl < Br < I < At$

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(D) Atomic radius decreases across a period from left to right due to an increase in effective nuclear charge.$(a)$ $Li, Be, N, F$ belong to the second period. Arranging them in increasing order of atomic radii: $F $(b)$ $Cl, Br, I, At$ belong to the halogen group ($17^{th}$ group). Atomic radius increases down a group due to the addition of new shells. Arranging them in increasing order: $Cl Therefore,the correct sequence is $(a) F < N < Be < Li$ and $(b) Cl < Br < I < At$.

Arrange the following elements in increasing order of their atomic radii.
$(a)$ $Li, Be, F, N$
$(b)$ $Cl, At, Br, I$

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Arrange the following elements in increasing order of their atomic radii.$(a)$ $Li, Be, F, N$$(b)$ $Cl, At, Br, I$