BrCl Lewis structure

BrCl (bromine monochloride) has one bromine atom and one chlorine atom.

In the BrCl Lewis structure, there is a single bond between the bromine and chlorine atom, and on both bromine and chlorine atoms, there are three lone pairs.

Alternative method: Lewis structure of BrCl

Rough sketch

• First, determine the total number of valence electrons

In the periodic table, both bromine and chlorine lie in group 17.

Hence, both bromine and chlorine have seven valence electrons.

Since BrCl has one bromine atom and one chlorine atom, so…

Valence electrons of one bromine atom = 7 × 1 = 7
Valence electrons of one chlorine atom = 7 × 1 = 7

And the total valence electrons = 7 + 7 = 14

Learn how to find: Bromine 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

We have to place the least electronegative atom at the center.

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

• And finally, draw the rough sketch

Lone pair

Here, we have a total of 7 electron pairs. And one Br — Cl bond is already marked. So we have to only mark the remaining six electron pairs as lone pairs on the sketch.

Also remember that bromine is a period 4 element, so it can keep more than 8 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 atom is chlorine.

So for each atom, there are three lone pairs.

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

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

Here, both bromine and chlorine atoms do not have charges, so no need to mark the charges.

Final structure

The final structure of BrCl comprises a bromine atom linked to a chlorine atom through a single covalent bond. In this layout, both the bromine and chlorine atoms satisfy the octet rule by sharing one pair of electrons and retaining three lone pairs each. Within this configuration, both halogen atoms achieve a stable valence shell equivalent to that of a noble gas. This arrangement represents the most stable state for the molecule because it results in a formal charge of zero for every atom involved. Consequently, this specific electronic distribution serves as the definitive and most accurate Lewis representation of bromine monochloride.

Next: BeI₂ Lewis structure

External video

• How to Draw the Lewis Dot Structure for BrCl: Bromine monochloride – YouTube • Wayne Breslyn

External links

• https://techiescientist.com/brcl-lewis-structure/
• https://lambdageeks.com/brcl-lewis-structure/