Chemistry Practice Problems Octet Rule Practice Problems Solution: Write a Lewis structure for each of the following ...

Solution: Write a Lewis structure for each of the following molecules that are exceptions to the octet rule.BBr3

Problem

Write a Lewis structure for each of the following molecules that are exceptions to the octet rule.

BBr3

Solution

We’re being asked to draw a Lewis structure for BBr3 and determine the exception of the octet rule that occurs.


Recall that the octet rule states that an element is surrounded by eight electrons in the Lewis structure. 


Exceptions to this rule occur when:

• there is an odd number of electrons, like in radicals

• there are less than 8 electrons or incomplete octet

• there are more than 8 electrons or expanded octet. This occurs to nonmetals from Period 3 to 7.


For this problem, we need to draw the Lewis structure for BBr3


To do so, we need the following steps:

Step 1: Determine the central atom in this molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.


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