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Looking at the discussion below, shouldn't the picture be changed to one that shows two single bonds and a double bond? Theislikerice (talk) 14:14, 2 November 2012 (UTC)
What is the bond structure of SO3?
Erm... Actually, it's a very simple question. The octet rule only really applies to the 2nd period.
Elements in period 3 or lower have access to the d-subshell (the transition metal block). As a result, they have a maximum of 18 outer shell electrons. Hence, for transition metals and lower main group chemistry, the 18 electron rule can be used instead.
So: Sulphur Trioxide...
3 Oxygen atoms which can only be at an oxidation state of -2 (because oxygen doesn't like anything other than -2 or 0), so subtract that leaves 12 outer shell electrons around the sulphur nucleus. Thus sulphur is present in it's +4 oxidation state. All oxidation states comply and the total of 18 electrons is maintained.
Oh, anf FYI, the molecule exhibits sp<sup3d hybridisation, unless I'm mistaken. I'm a little hazy on the exact bonding structure, however... It's been a couple of years. --Xanthine 12:14, 25 January 2006 (UTC)
The sulfur in SO3 does not need to breach the octet rule. The sulfur trioxide molecule exhibits resonance, with one double and two single bonds to the oxygens. The molecule is trigonal planar, but the bonds are not double bonds. Instead, the molecule exhibits one delocalized pi bond (the molecule has resonant structures). Roznerjs (talk) 03:14, 25 April 2008 (UTC)
(Transferred from main article and edited for HTML. Physchim62 20:12, 16 September 2005 (UTC))
The nomenclature in the synthesis of SO3 is not correct. Sodium bisulfate = sodium pyrosulfate = NaHSO4. On the contrary, Sodium PERsulfate is something quite different: Na2S2O8. This is probably what is synthesised. 131.174.15.229 10:09, 12 September 2005 (UTC)
What's up with the cookbook recipe-like section on how to make sulfur trioxide? It's pretty funny, the way it's written, to read, though. ;) Bayerischermann 23:53, 2 October 2005 (UTC)
The link "Sigma Aldrich" does not guide me to a specific page about "Sulfur trioxide". It seems, that this is a spam link.
That was not trying to be a spam link, the MSDS there is a good source of information but I am not sure that it is citable. The main thing is that the NFPA health hazard is a 4 not a 3. If you go to: http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=425478%7CALDRICH&N5=SEARCH_CONCAT_PNO%7CBRAND_KEY&F=SPEC then download the MSDS, the NFPA rating can be seen. ShreadedWheat (talk) 18:19, 2 August 2011 (UTC)ShreadedWheat
More about "chemical suppliers": http://en.wikipedia.org/wiki/User_talk:213.188.227.119
Best regards
I believe that the gamma form is hexagonal, but I can't find a reference to verify this. Anybody who can verify this is invited to add the fact to the Crystal Structure paragraph. Karlhahn 17:37 13 August 2006 (UTC)
Smokefoot has eliminated the conditions under which the mixed alpha-beta-gamma forms arise. The section as it now stands begs the question of how to get the beta form. Karlhahn 19:15, 21 August 2006 (UTC)
The text currently contains the sentence, "Only upon heating to ~340 °C does sulfuric acid revert to sulfur trioxide and water." This suggests that you can separate H2SO4 into SO3 and water simply by heating it. In reality you end up with a mixture of two gases (actually three gases because thermodynamics requires that some H2SO4 remain no matter how hot you get it) and like any gas mixture, it does not magically separate. So perhaps a qualifier to the sentence is in order -- something like, "although this is not a feasible means of separating H2SO4 into SO3 and water." Karlhahn 01:25, 22 August 2006 (UTC)
Is this page still classified as a stub --Dinna89 12:10, 15 August 2006 (UTC)
This image should be added to the information box, I just have no idea how to do it. (http://commons.wikimedia.org/wiki/Image:Sulfur-trioxide-3D-vdW.png) —Preceding unsigned comment added by 66.130.16.181 (talk) 22:25, 29 November 2007 (UTC)
I'm concerned about several things in the infobox. The density of the gas would be nice in there as its melting point is above room temperature. (The vapor is 2.76 time denser than air see the MSDS in link in the SigmaAldrich section.)
Where it says hydrolyzes to form sulfuric acid, where it actually takes up a water molecule to form sulfuric acid. Hydration would be more appropriate.
ShreadedWheat (talk) 18:43, 2 August 2011 (UTC)
Also the link listed as 3162-58-1 goes to a page that says that number doesn't exist. --81.149.74.231 (talk) 11:16, 24 May 2012 (UTC)
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At the top of the Sulfur trioxide properties table, there is an image of the SO3 molecule shown with three double bonds, implicating a bond order of 2. But suddenly, in the "Molecular structure and bonding" section, it says that the Lewis structure consists of an S=O double bond and two S–O dative bonds, implicating a bond order of 1.3333333333... The two structures contradict to each other. Or... are they? Why not two S=O double bonds and one S–O dative bond? Bernardirfan (talk) 18:13, 6 July 2020 (UTC)
A discussion is taking place to address the redirect Sulfan. The discussion will occur at Wikipedia:Redirects for discussion/Log/2021 July 19#Sulfan until a consensus is reached, and readers of this page are welcome to contribute to the discussion. Leyo 08:06, 19 July 2021 (UTC)