A) Na
B) K
C) Br
D) Li
Correct Answer: C
Solution :
When we move from left to right in the Periodic Table, atomic radius decreases. While in a group atomic radius increases from up to down. Moreover, the radius of alkali metals is metallic radius and that of halogens is covalem radius and metallic radius > covalent radius Thus, Br has the smallest atomic radius.
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