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The number of hybridized orbitals matches the number of electron density regions in the shape of the molecule. So if there are four electron density regions it could be sp3. I don't think there is such thing as sp4 because the p-orbital only has three sub-orbitals.
sp2 orbitals should be used when there are three regions of electron density in a molecule. sp3 orbitals should be used when there are four regions of electron density in a molecule. sp orbitals are used when there are only two regions of electron density. sp4 does not exist, to create five bonding orbitals, the hybridization would be sp3d.
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