Write the outer electronic configuration of alkali metals. Discuss the justification for their position in group $1$ of the periodic table.

(N/A) All alkali metals have a common outer electronic configuration of $ns^1$,where $n$ represents the principal quantum number. This uniform electronic configuration is the primary reason for their similar chemical properties and their placement in Group $1$ of the periodic table. The electronic configurations are as follows:

Element	Electronic Configuration
$Li$ $(Z=3)$	$[He] 2s^1$
$Na$ $(Z=11)$	$[Ne] 3s^1$
$K$ $(Z=19)$	$[Ar] 4s^1$
$Rb$ $(Z=37)$	$[Kr] 5s^1$
$Cs$ $(Z=55)$	$[Xe] 6s^1$
$Fr$ $(Z=87)$	$[Rn] 7s^1$