Question

Why do `SP^2` hybrid orbitals form?

Answer 1

In order to allow more bonds and achieve greater stability

Explanation:

For example Boron forms three bonds when it hybridizes to `sp^2` form. This allows the formation of molecules like `BCl_3`

Without hybridization Boron has the electronic configuration of
`1s^2 2s^2 2p^1` Paired electrons like the `2s^2` have difficulty bonding because of the Pauli exclusion principle. Hybridizing allows the `2s^2` electrons to be used for bonding.

When Boron can form three bonds it is more stable than when it can form only one bond using the `2p^1` electron. So hybridization allows for greater bonding and greater stability.