【】CS2 Lewis Structure ,Valence Electrons ,Formal Charge,Polar or Nonpolar

 CS2 Lewis  Structure 

Answer:

CS2 Lewis structure(carbon disulfide electron dot structure) is that type of diagram where we show the total 16 valence electrons of CS2 as dots , or dots and dashes(-).In Lewis structure,it is common that a bonding pair of two electrons can be shown by  dash(-) or dots(●●) but a lone pair of two electrons is shown by dots[●●].

CS2 Lewis  Structure

In CS2 Lewis structure,two double bonds are going from carbon to sulfur.There are four lone pairs in CS2 Lewis structure.

In CS2 Lewis structure,the carbon atom follows the octet rule and the sulfur atoms  also follow the octet rule.Thus,in CS2,all follows the octet rule.

In CS2 Lewis structure,we get eight pairs of electrons.Out of eight pairs of electrons,CS2 has four bond pairs and four lone pairs of electrons.

Explanation:

Hello,today I am going to draw the CS2 Lewis  structure  in just five steps.


       CS2 Lewis  structure Setup Step-1:

To draw the CS2 lewis  structure , we have to find out the CS2 valence electrons first.We express valence electrons as dots in CS2 lewis dot structure.



To get the valence electrons of carbon,we need to look at the electronic configuration of carbon.



C(6)=1s²2s²2p²



The highest value of principal quantum number here is n=2.


The highest value of principal quantum number ,n , indicates the valence shell and we know the electrons in valence shell is called valence shell.




The nunber of valence electrons in carbon is 4.







Now,to draw the lewis dot structure of carbon,we need to imagine a square around carbon.

                  口




We know a square has four sides.At first,we have to place one valence electrons as dot to every side of that square before pairing up.


Again, we have to find out the valence electrons of sulfur(S).

To get the valence electrons of sulfur(S),we need to look at the electronic configuration of sulfur(S).


S(16)=1s²2s²2p⁶3s²3p⁴

The highest value of principal quantum number here is n=3.

The highest value of principal quantum number ,n , indicates the valence shell and we know the electrons in valence shell is called valence shell.




The nunber of valence electrons in sulfur(S) is 6.

 Step-2:  CS2 Valence   Electrons   

Now we have to count total number of CS2 valence electrons.

C =4

2×S=2×6=12


So,the total number of CS2 valence electrons is sixteen( 4+12=16) .

Here is the another way to find out the CS2 valence eletrons.

The  carbon is an element of group 4A,so carbon has four valence electrons.Besides,the sulfur is an element of group 6A,so it has 6 valence eletrons.

For CS2,

C --->4

2S ---->6  ×2 =12

------------------------

CS2 = 16 V.E.


     CS2 Lewis  structure Setup Step-3:       

Now we have to determine the central atom in CS₂.The central atom is that kind of atom that is single or that has lower electronegativity.In case of CS₂,Carbon,C, is the central atom and S is the outer atom .



              CS2 Lewis  structure Setup Step-4::

Now we need to connect the outer atoms with  the central atoms using dots or line(-).Every line represent two 【●●】dots or two valence electrons.

Or,

In the above structure,we have used 4 valence electrons.So,we have 16-4=12 left.



Now we will use these 12 valence electrons to satisfy the outer atoms for completing its octet first.

Or,

Look,we have used all the 16 valence electrons in CS2.

Now we need to satisfy the central atom for its octet by using the lone pair from outer atoms.So, from the above structure we will get three probable structures.

Or,

CS2 Formal Charge

The above three structures are the probable CS2 Lewis  structures .To find the best CS2 Lewis dot structure from these three,we have to apply the formula for formal charge.

Formula-1:

Formula-2:

Formal Charge=Valence Electrons-Dots-Lines

Formula -3:

Formal Charge=Valence Electrons - Unshared electrons - 1/2(Shared Electrons)

Now we need to calculate the formal charge for each atom of the above three structures.

Formal charge for CS2 Lewis structure  (C)

●The formal charge of sulphur is zero.

•Valence electrons of S =6

•Shared electrons of S= 4

•Unshared electrons of S =4

●F.C. of S =6- 4 -1/2(4)

                  =6-4-2

                 =6-6

                   =0 

●The formal charge of carbon is also zero.

•Valence electrons of C =4

•Shared electrons of C= 8

•Unshared electrons of C =O

F.C. of C =4 - 0 -1/2(8)

                  =4-0-4

                 =4-4

                   =0 

So,the best CS2 lewis dot structure  will be the one where most atoms will have zero formal charge.Here,(C) is the best lewis dot structure for CS₂.

Best CS2 Lewis Structure

Or,

Best CS2 Lewis Structure

Continue

Questions and Answers

●How many double bonds are there in the Lewis structure for carbon disulfide, CS2?

Answer:

There are two double bonds in the Lewis structure for carbon disulfide,CS2.

●What is the formal charge on the carbon in the correct Lewis structure for cs2?

Answer:

The formal charge on the carbon in the correct Lewis structure for CS2 is zero.

●What is the formal charge on the sulfur in the correct Lewis structure for cs2?

Answer:

The formal charge on the sulfur in the correct Lewis structure for CS2 is zero.

● Is CS2 (Carbon disulfide) polar or 

nonpolar?

Answer:

CS2 is a nonpolar molecule.Again,Carbon disulfide is nonpolar because of its linear shape which makes the net molecular dipole moment zero.

Explanation:

Here are the few steps that you help you to determine that carbon disulfide,CS2, is a non polar molecule.

           Step-1:

Draw the Lewis structure of CS2.

             Step-2:

After drawing Lewis structure of CS2,now you need to consider the electronegativity difference between atoms.

Here sulphur is more electronegative than carbon.So,every  carbon-sulphur bond is polar.

               Step-3:

Now consider bond dipole moment.

As both carbon and sulphur bonds are polar,every bond has a dipole moment.

             Step-4:

Now consider the geometry of CS2 molecule by applying VSEPR theory.

According to VSEPR theory,we get linear shape of CS2.

                 Step-5:

Now consider the net molecular dipole moment.

As the shape of CS2 is linear,one bond dipole moment cancel another bond's dipole moment.Thus,we get zero value for the net molecular dipole moment .As the value of net molecular dipole moment is zero,we can say that CS2 is nonpolar.