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QUESTION

# What is the hybridization of the central iodine atom in I3−?

sp^3d

The easiest way to determine this is to draw the lewis structure of the species. What's important here is knowing that the species, I can become hypervalent, or that is, it will disobey the by expanding its valency to accept more than eight electron around it.

Another good example of a species which does this is XeF_4.

Consider below:

Remember when forming hybrid orbitals, we always know that we must:

use n atomic orbital to make n hybrid orbitals

and

for n=5 we know that we make sp^3d hybrids.