Hello friends, you can have countless doubts regarding the polarity in part molecules in the chemistry world. Plenty of of us have actually a doubt about the polarity of SO2 (sulfur dioxide). So, I will certainly share my information with friend to clean the doubt regarding the polarity the SO2.

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Is SO2 polar or nonpolar? SO2 is polar in nature since of the distinction in electronegativity between sulfur and oxygen atoms. The greater the difference in electronegativity an ext will be the polarity the the molecule. The bent form of SO2 is since of the repulsion between the unbonded electrons existing on the sulfur and oxygen atoms. The unsymmetrical shape likewise identifies whether a molecule is polar or not.

Why is SO2 Polar?

In the SO2 molecule, the Sulfur has 6 electrons in that is vacant shell and also Oxygen additionally has 6 electron in the vacant shell. 4 electrons of sulfur bond through the two pairs of electron from both oxygen atoms around sulfur.

And after ~ bonding in the SO2 molecule, the unequal charge stays on Sulfur and Oxygen. 2 unbonded electrons remain on Sulfur and 4 electron on both the the Oxygen atoms.

Therefore, unequal charge distribution occurs ~ the bonding the the SO2 molecule. The lone pair present on Sulfur and also lone present on Oxygen atoms causes repulsion between each other.

The Sulfur is more electronegative than Oxygen, together a result, the Oxygen-Sulfur bond share unequal charge distribution, and the bond created in it is polar.

According come the VSEPR theory, the repulsion between two lone bag is better than the repulsion between the lone pair and also bond pair.

Similarly, in the SO2 case, the lone pair present on Sulfur and also Oxygen atoms produces repulsion between them.

In such instances as SO2, where much more than one lone pair group is present, the geometrical shape of the molecule is slightly different as compared to the molecule whereby all groups are bonds.

Factors affect the polarity that a chemistry compound

The polarity that a molecule is decided based upon the uneven charge circulation of the atoms affiliated in the molecule. The unequal charge distribution results in the net dipole moment.

The molecule which has a non-zero worth of network dipole minute is polar vice versa, the molecule which has net dipole moment equates to zero is non-polar. The CO2, O2 is an instance of non-polar molecules.

You deserve to read out the article for the reason of the non-polarity of CO2.

The molecules that have actually zero network dipole moment is due to equal charge circulation on the atoms in the molecule. Therefore, the dipole minute gets canceled out and results in a net-zero dipole moment.

Dipole moment = Bond length * charge on every element

The calculation dipole moment of SO2 (sulfur dioxide) is 1.6 debyes.

It is much better to recognize that the distinction in electronegativity is just one of the main factors that affects polarity.

The polarity of a molecule is directly proportional come the difference between the electronegativities that the atoms involved in the molecule.

The polarity and non-polarity the a molecule relies on the various determinants such as

Molecular geometry that the moleculeThe variety of identical atom present.The variety of lone pairs present in the molecule.The the contrary of the molecule.

In the human being of chemistry, electronegativity is a measure up of how strongly one atom can entice an electron towards itself.

More electronegative atom have the right to strongly tempt electron and also low electronegative atom deserve to weakly attract the electron.

SO2 link Angle


The SO2 molecule develops the shape of the trigonal planar. The lone pair repulsion among the Oxygen and Sulfur develops a bent shape and also the angle between the bonds is uncovered to be around 119-120 degrees.

The position of the atom in the SO2 is such that the Sulfur atom is current in the center/between both of the Oxygen atoms.

However, the lone pair current on the Sulfur atom reasons repulsion through the lone pair existing on the Oxygen atoms bring about the V-shape/bent-shaped SO2 molecule.

The bond angle in SO2 = 120 degrees.

For more detailed information concerning geometry, hybridization, and also lewis structure of SO2, you should likewise refer to the post on the lewis framework of SO2.

Polar and also Non-Polar Compounds

We every should know that once two atoms type a bond, they usually share electrons from each other.

And also, that is crucial to save in mind that two different atoms execute not same share the electron of every other. That is due to the fact that of the electronegativity difference.

The atom with an ext electronegativity attractive the pair of external inspection electrons toward itself as contrasted to the atom of lesser electronegativity.

As every the studies already done, the bond formed in between two atoms is polar covalent if the electronegativity difference lies in between 0.5 and 1.6.

In this bond, the center of an unfavorable charge does no lie in the center. It would certainly be at the end of one atom with greater electronegativity.

And if the electronegativity distinction is lesser than 0.5, the shortcut is non-polar covalent. Whereas, if the electronegativity difference is above 2, the bond is ionic.

For example, in the instance of SO2, Oxygen has actually a higher electronegativity 보다 Sulfur and it renders it polar. The electronegativity the Sulfur is 2.58 whereas the electronegativity that Oxygen is 3.44.

And in the situation of NaCl, the Chlorine atom has actually a higher electronegativity than Sodium, due to which the Chlorine atom traction the electron mutual pair in the direction of itself.

If you room a student of science, the is very helpful to remember that as you relocate right in the periodic table of chemistry, the electronegativity of facets gets higher.

Also, together you relocate up in the periodic table, the electronegativity that the elements gets higher.

Thus, if you desire to check if a molecule is polar or not.

You need to note under the value of electronegativity the atoms associated in the molecule, the variety of lone pairs and also bonds.

And the in its entirety geometrical form of the molecule. This details is sufficient to conclude whether the molecule is polar or non-polar.


In this article, i tried come cover the polarity of sulfur dioxide, and the determinants that impact the polarity, how to examine the polarity the a molecule v the information forced to conclude.

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I hope, i cleared her all doubts concerning the polarity of SO2 and also made you know the fundamentals the the polar and non-polar bonds.