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NEET levelSingle correct optionDifficulty 1 of 3pt066

Among the second-period elements $Li$ , $B$ , $N$ and $F$ , the one with the smallest atomic radius is:

A $F$
B $B$
C $Li$
D $N$

Answer: A

Across a period the radius decreases as

Z_{eff}

increases with the same number of shells. F lies farthest to the right, so it is smallest.

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