hybridization

[Guzman_1J]

So hybridization only rises as a result of electron promotion in an element?

[chemboi]

I believe that electron promotion is not necessary for hybridization. For example, it does not occur in NH3, which has hybridization.

[Sears 4A]

hybridization works when an atom is bonded to another atom that has electrons that exist within a different electron energy level

[Melvin Reputana 1L]

Hybridization does not arise solely from electron promotion. It can still arise without it such as in ammonia (NH3) where Nitrogen has 5 valence electrons with all its p orbitals filled with one electron. You would find that there would be four sp3 orbitals; however, three of them only have one electron and form the 3 sigma bonds found in ammonia. The fourth sp3 orbital would be filled with two electrons which represents the lone pair on nitrogen.