The alkali metal with the smallest atomic radius is __________.

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Solution

Atomic radius is the distance between the nucleus and the outermost orbital of an atom.
In a periodic table group, elements are arranged in increasing order of atomic radius.
Alkali metals form the first group of the periodic table. The Alkali metals in increasing order of atomic number and atomic radius are Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr).
So, Lithium is the smallest alkali metal and thus has a smaller atomic radius.
Hence, Lithium is an alkali element with the shortest distance between the nucleus and valence shell.
Therefore, Lithium is the alkali metal with the smallest atomic radius.

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