State the electronic configurations of Group-$17$ elements.
The general valence shell electronic configuration of Group-$17$ elements (halogens) is $ns^2 np^5$,where $n$ ranges from $2$ to $6$.
The specific configurations are:
$F$ $(Z=9)$: $[He] 2s^2 2p^5$
$Cl$ $(Z=17)$: $[Ne] 3s^2 3p^5$
$Br$ $(Z=35)$: $[Ar] 3d^{10} 4s^2 4p^5$
$I$ $(Z=53)$: $[Kr] 4d^{10} 5s^2 5p^5$
$At$ $(Z=85)$: $[Xe] 4f^{14} 5d^{10} 6s^2 6p^5$
The specific configurations are:
$F$ $(Z=9)$: $[He] 2s^2 2p^5$
$Cl$ $(Z=17)$: $[Ne] 3s^2 3p^5$
$Br$ $(Z=35)$: $[Ar] 3d^{10} 4s^2 4p^5$
$I$ $(Z=53)$: $[Kr] 4d^{10} 5s^2 5p^5$
$At$ $(Z=85)$: $[Xe] 4f^{14} 5d^{10} 6s^2 6p^5$
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