Commonly Tested Lewis Structures

We draw Lewis Structures to predict:

-the shape of a molecule.

-the reactivity of a molecule and how it might interact with other molecules.

-the physical properties of a molecule such as boiling point, surface tension, etc.

Drawing the Lewis Structure for BrO₃^-

Video: Drawing the Lewis Structure for BrO₃^-

In the BrO3- Lewis structure Bromine (Br) is the least electronegative and goes in the center of the dot structure. Remember that Bromine (Br) can hold more than 8 valence electrons and have an expanded octet.

For the BrO3- Lewis structure, calculate the total number of valence electrons for the BrO3- molecule. After determining how many valence electrons there are in BrO3-, place them around the central atom to complete the octets. Be sure to use the number of available valence electrons you found earlier.

For the Lewis structure of BrO3- you should take formal charges into account to find the best Lewis structure for the molecule. Also note that you should put the BrO3- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.

It is helpful if you:

• Try to draw the BrO₃^- Lewis structure before watching the video.
• Watch the video and see if you missed any steps or information.
• Try structures similar to BrO₃^- for more practice.

List of Lewis Structures

Acetone	BF3	BH4-	BrF5	BrO3-	C2H2	C2H4	ClO-
CH4	ClO2-	ClO2	ClO4-	CO	CS2	H2O	H3O+
HCl	HNO3	I3-	ICl4-	IF5	N2	N3-	NH2OH
NH3	NO2-	NO2	NO3-	O2	OF2	PCl5	PH3
PO33-	PO43-	SCl2	SF4	SF6	SO3	SO42-	XeF2
XeF4