The atom of smallest atomic radius among the following is

N a

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K

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B r

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L i

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Solution

The correct option is D $B r$
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 covalent radius and metallic radius $>$ covalent radius.
Thus, $B r$ has the smallest atomic radius.

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