## Finding Hybrid Orbitals

Alyssa McLeod 3E
Posts: 13
Joined: Wed Sep 21, 2016 2:59 pm

### Finding Hybrid Orbitals

One way to predict hybrid orbitals is to calculate the number of electron pairs. For H3O+ oxygen has 6 valence electrons, 3 hydrogens have three, minus one electron equals 8 electrons, or 4 pairs, which means the hybrid orbital is sp3. So, then, in Icl2- iodine has 7 valence electrons and 2 Chlorines have... 2? Why is chlorine not also 7 (2Cl would then be 14e). I understand that chlorine is only sharing one electron each, but then iodine is only sharing two, and in the earlier example oxygen is sharing only three. So my question is, when using this method, what exactly am I looking at to calculate the electron pairs? Am I looking at electrons shared, valence electrons, etc? Thanks!

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: Finding Hybrid Orbitals

Try drawing the Lewis structures for each, then make sure all valence electrons are accounted for. Then you can count the number of electron pairs.

Rosalva_Mejia_41
Posts: 19
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Finding Hybrid Orbitals

Can you help explain how to draw Lewis structures for elements like xeon? Since the orbitals are filled I thought it couldn't bond with other elements.

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: Finding Hybrid Orbitals

Can you give a specific example?

Alyssa McLeod 3E
Posts: 13
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Finding Hybrid Orbitals

Got it! Around the central atom only, yes? I think that was my error. So from there, I can calculate that ICl2- has 5e- pairs, which corresponds with the configuration sp3d. Why? Is that something I should memorize, or is there an efficient calculation I can do to go from electron pairs to a particular type of hybrid orbital?

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: Finding Hybrid Orbitals

Hybrid orbitals are linear combinations of atomic orbitals. Dr. Lavelle will teach you about orbital hybridization in class. Since he has not yet gone over it, and it will not be on the quiz, I think that it is best to put that question on hold for now. If it is still confusing after he lectures on it, then ask.