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QUESTION

# What is the AXE classification of HCLO3 and therefore what would it moleculuar shape be? Thankyou. I am confused between AX4E or AX3E because I am not sure if the H counts as a constituent atom since it is bonded to the O.

Here's what's going on here.

It's always a good idea to start by drawing the of the molecule, this will give a good idea of what it's going on interms of .

Keep im mind that Lewis structures are not meant to convey geometry, the are just helpful in determining geometry!

In the case of chloric acid, "HClO"_3, you can draw several valid Lewis structures called .

However, the will come out the same regardless of which Lewis structure you use, so I'll just pick one to make things clearer.

Notice that chlorine is bonded to three other atoms, all oxygen atoms, and that it has one lone pair attached, and so its "AXE" model will correspond to "AX"_3"E"_1.

The chlorine atom is surrounded by four regions of electron , which means that the geometry around the chlorine atom is trigonal pyramidal.

The oxygen atom that has the hydrogen attached is also surrounded by four regions of electron density: two bonds, one to hydrogen and the other to chlorine, and two lone pairs of electrons.

Its "AXE" model will thus be "AX"_2"E"_2, which corresponds to a bent geometry.

Therefore, you can say that the chloric acid molecule has a trigonal pyramidal geomety for the chlorine atom and a bent geometry for one of its oxygen atoms.