1.

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

Answer»

3RD PERIOD
4th period
2ND period
5th period

Solution :FIVE vacant orbitals (3d-level) are present in CL `(1s^2 2s^2 2p^6 3s^2 3p^5)` which belongs to 3rd period.


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