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Got stuck on molecular structure

by asdff529
Tags: molecular, structure, stuck
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asdff529
#1
Nov22-12, 05:20 AM
P: 32
The S molecule of SO2 forms a double bond with one O and dative covalent bond with another O
Meanwhile,XeO4 is a molecule which Xe forms a double bond with each O
I have a question here
Why doesnt that S forms 2 double bonds with O to extend its octet structure?
Similarly,why doesnt that Xe form 4 dative covalent bond with O to maintain its octet structure?
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DrDu
#2
Nov22-12, 05:42 AM
Sci Advisor
P: 3,596
Neither sulfur nor xenon extend their octet in these compounds and a distinction between double bonded and dative bonded oxygens is purely fictive.
asdff529
#3
Nov22-12, 07:45 AM
P: 32
Quote Quote by DrDu View Post
Neither sulfur nor xenon extend their octet in these compounds and a distinction between double bonded and dative bonded oxygens is purely fictive.
why do u say that "Neither sulfur nor xenon extend their octet in these compounds"
if i draw the electron diagram of Xe,i count there should be 16 outermost electrons around Xe?

DrDu
#4
Nov22-12, 08:43 AM
Sci Advisor
P: 3,596
Got stuck on molecular structure

Bonding in these compounds is quite complex. Maybe you can find in your library
http://eu.wiley.com/WileyCDA/WileyTi...fContents.html
asdff529
#5
Nov22-12, 08:47 AM
P: 32
Quote Quote by DrDu View Post
Bonding in these compounds is quite complex. Maybe you can find in your library
http://eu.wiley.com/WileyCDA/WileyTi...fContents.html
i think im not able to understand it
btw,thx a lot
asdff529
#6
Nov22-12, 08:53 AM
P: 32
but can i explain like this:
since electrons are indistinguishable,and they all move randomly around the atoms
so it is indistinguishable whether it is dative or pure covalent?
DrDu
#7
Nov23-12, 10:13 AM
Sci Advisor
P: 3,596
Maybe this wikipedia article is helpful:

http://en.wikipedia.org/wiki/Hypervalent_molecule


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