The cluster shown here is formed by five sp³d orbitals.
Hybridization is an idea put forward by Linus Pauling to explain the bonding in certain molecules. Hybridization has to do with the mixing of atomic orbitals. When atomic orbitals mix, equivalent hybrid orbitals suitable for bonding are formed.
The number of hybrid orbitals formed is equal to the number of atomic orbitals that were combined to form the hybrid orbitals. For sp³d hybrid orbitals; three p, one s and one d orbitals, a total of five atomic orbitals combine to form five equivalent sp³d hybrid orbitals.
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