Identify the alkali metal having the smallest | vedclass

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(A) $1$. Alkali metals belong to Group $1$ of the periodic table.$2$. The order of elements in Group $1$ from top to bottom is $Li, Na, K, Rb, Cs, Fr$

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Sodium

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(A) $1$. Alkali metals belong to Group $1$ of the periodic table.$2$. The order of elements in Group $1$ from top to bottom is $Li, Na, K, Rb, Cs, Fr$.$3$. Atomic size increases down a group due to the addition of new electron shells.$4$. Among the given options, $Na$ $(Z=11)$ is the highest in the group, followed by $K$ $(Z=19)$, $Rb$ $(Z=37)$, and $Cs$ $(Z=55)$.$5$. Therefore, $Na$ has the smallest atomic size among the given options.

Identify the alkali metal having the smallest atomic size from the following.

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