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 C₂H₄

For C₂H₄ you have a total of 12 total valence electrons.

Drawing the Lewis structure for C₂H₄ (named ethene) requires the use of a double bond. In a double bond two pairs of valence electrons are shared (for a total of four valence electrons).

Remember that hydrogen atoms always go on the outside of a Lewis structure and that they only need two valence electrons for a full outer shell.

Video: Drawing the Lewis Structure for C₂H₄

It is helpful if you:

• Try to draw the C₂H₄ Lewis structure before watching the video.
• Watch the video and see if you missed any important steps or information.
• Try structures similar to C₂H₄ (like O₂) 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