The center of the covalent chemical, selenium tetrachloride, contains an atom of selenium. According to VSEPR theory, a center atom with four covalently coupled terminal atoms and one nonbonding pair adopts a see-saw molecular geometry. These details suggest that the central selenium's orbital hybridization will be sp3d.
VSEPR theory is used to forecast the shape of a model molecule for a particular covalent chemical complex. After this bonding, there might still remain non-bonding pairs since the core atom might not necessarily use up all of its initial available valence electrons. Calculating the hybridization involves counting the non-bonding pairs and covalently connected terminal atoms on the central atom.
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