SO3 stands for Sulfur Trioxide. This is one of the most pollutant chemical compounds in the gaseous form. It is additionally a main agent in the mountain rain. The main use that this component is to do sulfuric acid for commercial purposes.

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SO3 which is additionally spelled as Sulphur Trioxide sometimes, is a trigonal planar molecule that is non-flammable. In this article, i will administer you part information regarding SO3 molecular geometry through the explanations of Lewis structure, polarity, and also hybridization.

Sulfur Trioxide molecular Geometry

Being one intelligent and well-practiced human being, friend must understand what is molecular geometry, yet let me review it because that the all young students the end there. Molecular geometry is the three-dimensional structure of the atoms which help in the constitution of a molecule. It deserve to determine reactivity, polarity, color, attraction, organic activity, etc.

SO3 includes two materials mainly – Sulfur and also Oxygen. There are one sulfur atom and three oxygen atom which room spread out as far away as they can! atoms of oxygen room surrounded by electrons. These electrons are an unfavorable and repel every other.

You can also remember it by AXN. Where;

A means Sulfur, i beg your pardon is main atomX represents No. Of atom bonded with central sulfur

In this formula the SO3, we don’t have any kind of non-bonding electron, and that is why us don’t bother about N. Moreover, as there space three oxygen, it will certainly be X3.

That method we have actually AX3 for the SO3 molecule. (By the way, the is the reason why SO3 is having the shape of Trigonal Planar.) The bond edge of SO3 is 120 degrees.

Lewis framework of SO3

Valence: Here, sulfur in the center due to the fact that of its lowest electron capability, and three oxygen roughly it. Sulfur brings 6, and oxygen brings 3 each. That means; SO3 has actually 24 valence electrons. 6 + (3 x 6) = 24.

Now have actually a look of Lewis framework again;


When we draw it, firstly we get the three frameworks at the top. Sulfur in the center and Oxygen approximately it is do a link (each) come the central atom. There must be single bonds initially.

There are 6 electron in the framework which we have made, and also there space 24 in total. Therefore we should put 18 electron down. Now fill the outer atoms so that it satisfies the octet rule.

It looks prefer this;


Tip: once you placed them, start counting from 7 come 24.

Then take a decision concerning the official charge. Formal fee helps friend to figure out which atom don’t require electrons.

It’s the no. The electrons that the atom brought (For example, the oxygen brings 6) minus the no. Of electrons which are alone that is the lone pairs around the atom minus half the variety of electrons in bonds.

If you desire to discover out, usage this formula to do it simple;

Formula: Valence electron – Dots – No. Of lines = ‘?’

If we talk around Sulfur, there will be 6 – 0 – 3 = +3.

Here in this case, for oxygen, we have 6 (oxygen) – 6 (dots) – 1 (bonds) = –1.

So, –1 indigenous the other 2 oxygen because all are the same!

The sulfur deserve to handle 12 electrons per atom. Now, take out 2 dots from every of the oxygen and also put one much more bond connection to each.

Now, it will look favor this;


So, together you can see, currently there room 10 electrons approximately it. Sulfur violate the octet rule. And the reason is that all official charges end up being 0. So, if friend recalculate the things, at last, it will certainly be choose 6 – 0 – 6 = 0. I hope you men are clear regarding the Lewis structure of SO3. Now, let’s talk around polarity.

Polarity of SO3

Many students have actually the inquiry – Is SO3 polar or nonpolar? few of the professionals likewise have the exact same confusion. Right here is the prize in the simplest explanation…


In this formula, all atoms that oxygen room symmetrical. They all are having the same variety of bonds and lone pair electrons. Now if we usage a model referred to as the VSEPR, (Valence covering Electron-Pair Repulsion – a version which is based upon the repulsive actions of electron pairs) us will find out that as all oxygen room spread out, castle repel each other, which suppose SO3 together nonpolar.

So from now onwards, once someone will ask you a question choose – is SO3 polar? girlfriend should provide answer confidently, NO the is not because they carry out not have any an adverse or hopeful signs. It is trigonal planar with symmetric charge distribution on the main atom.

SO3 Hybridization

As you have the right to see in the structure; between each atom, we have double bonds. One is a sigma bond (σ), and also the other one is the pi link (π). To find out SO3 Hybridization, us should find the steric number. The formula of steric number is the addition of the number of atoms bonded and also lone bag of electrons.

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There are 3 sigma bond which median we have three regions. One sigma bond and two bag of unbonded electrons. That method we have actually an S and two ns orbitals to it is in hybridized. In this case, the steric number is 3, therefore the hybridization of SO3 is SP2.

That’s it!!! This is the simplest explanation the SO3 electron geometry. Ns hope this article will be valuable for girlfriend whenever girlfriend need any kind of guidance or help to fix your confusions concerning the molecular geometry that SO3. At last, I simply want come say – never ever stop learning, due to the fact that curiosity is the vital to success. All the very best!