CH3Cl Lewis structure

CH₃Cl (chloromethane) has one carbon atom, three hydrogen atoms, and one chlorine atom.

In the CH₃Cl Lewis structure, there are four single bonds around the carbon atom, with three hydrogen atoms and one chlorine atom attached to it, and on the chlorine atom, there are three lone pairs.

Alternative method: Lewis structure of CH₃Cl

Rough sketch

• First, determine the total number of valence electrons

In the periodic table, carbon lies in group 14, hydrogen lies in group 1, and chlorine lies in group 17.

Hence, carbon has four valence electrons, hydrogen has one valence electron, and chlorine has seven valence electrons.

Since CH₃Cl has one carbon atom, three hydrogen atoms, and one chlorine atom, so…

Valence electrons of one carbon atom = 4 × 1 = 4
Valence electrons of three hydrogen atoms = 1 × 3 = 3
Valence electrons of one chlorine atom = 7 × 1 = 7

And the total valence electrons = 4 + 3 + 7 = 14

Learn how to find: Carbon valence electrons, Hydrogen valence electrons, and Chlorine valence electrons

• Second, find the total electron pairs

We have a total of 14 valence electrons. And when we divide this value by two, we get the value of total electron pairs.

Total electron pairs = total valence electrons ÷ 2

So the total electron pairs = 14 ÷ 2 = 7

• Third, determine the central atom

Here hydrogen can not be the central atom. Because the central atom is bonded with at least two other atoms, and hydrogen has only one electron in its last shell, so it can not make more than one bond.

Now we have to choose the central atom from carbon and chlorine. Place the least electronegative atom at the center.

Since carbon is less electronegative than chlorine, assume that the central atom is carbon.

Therefore, place carbon in the center and hydrogen and chlorine on either side.

• And finally, draw the rough sketch

Lone pair

Here, we have a total of 7 electron pairs. And four bonds are already marked. So we have to only mark the remaining three electron pairs as lone pairs on the sketch.

Also remember that carbon is a period 2 element, so it can not keep more than 8 electrons in its last shell. Hydrogen is a period 1 element, so it can not keep more than 2 electrons in its last shell. And chlorine is a period 3 element, so it can keep more than 8 electrons in its last shell.

Always start to mark the lone pairs from outside atoms. Here, the outside atoms are hydrogens and chlorine. But no need to mark on hydrogen, because each hydrogen has already two electrons.

So for chlorine, there are three lone pairs, and for carbon, there is zero lone pair because all three electron pairs are over.

Mark the lone pairs on the sketch as follows:

Formal charge

Use the following formula to calculate the formal charges on atoms:

Formal charge = valence electrons – nonbonding electrons – ½ bonding electrons

For carbon atom, formal charge = 4 – 0 – ½ (8) = 0

For each hydrogen atom, formal charge = 1 – 0 – ½ (2) = 0

For chlorine atom, formal charge = 7 – 6 – ½ (2) = 0

Here, the atoms do not have charges, so no need to mark the charges.

Final structure

The final structure of CH₃Cl features a central carbon atom linked to three hydrogen atoms and one chlorine atom through single covalent bonds. In this configuration, the carbon atom satisfies the octet rule by forming four total bonds, while the chlorine atom fulfills its octet by maintaining three lone pairs alongside its single shared bond. Within this layout, each of the three hydrogen atoms achieves its stable duet state through its respective single bond. This arrangement represents the most stable state for the molecule because it results in a formal charge of zero for every atom involved. Therefore, this specific electronic distribution serves as the definitive and most accurate Lewis representation of chloromethane (also known as methyl chloride).

Next: HBr Lewis structure

External video

• CH3Cl Lewis Structure – How to Draw the Lewis Structure for CH3Cl (Chloromethane) – YouTube • Wayne Breslyn

External links

• https://techiescientist.com/ch3cl-lewis-structure/
• https://geometryofmolecules.com/ch3cl-lewis-structure-molecular-geometry-bond-angle-hybridization/
• https://www.chemistryscl.com/general/CH3Cl-lewis-structure/
• https://lambdageeks.com/ch3cl-lewis-structure/
• https://www.thegeoexchange.org/chemistry/bonding/Lewis-Structures/CH3Cl-lewis-structure.html
• https://sciedutut.com/ch3cl-lewis-structure/