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  4. The halogen having five vacant orbitals in the outermost shell belongs to

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Q. The halogen having five vacant orbitals in the outermost shell belongs to

The p-Block Elements - Part2

Solution:

Five vacant orbitals (3-$d$ level) are present in $Cl_2$.
$ (1s^2 2s^2 2p^6 3s^2 3p^5)$ which belongs to 3rd period