![]() ![]() It communicates the structure of methane more clearly than a traditional Lewis structure without dash and wedge notation The correct Lewis structure with dash and wedge notation for CH 4 is depicted on the right in Figure 1. Bonds drawn with a solid triangle, or wedge, represent bonded atoms coming out of the page/screen towards the observer bonds drawn with dashed triangle, or dash, represent bonded atoms going into the page/screen away from the observer. Bonds drawn as simple lines are located in the plane of the page or screen. Chemists use dash and wedge notation to draw 3D molecules. ![]() Representing three dimensions on 2D paper (or computer screen) is challenging. The Lewis structure is misleading because it depicts methane as a planar ‘plus-shaped’ molecule, yet we know that methane is a non-planar, tetrahedral molecule. Methane (CH 4) depicted by a Lewis structure (left) and dash and wedge notation (right). Depicted on the left in Figure 1 is the Lewis structure for methane (CH 4) showing the central carbon atom singly bonded to four hydrogen atoms: Figure 1. The Lewis structure gives us meaningful information about the bonds between atoms, but Lewis structures do not depict how the molecule exists in three-dimensions. ![]() | Key Concepts and Summary | Glossary | End of Section Exercises | Lewis Structures with Wedge-Dash Notation | Lewis Structures with Wedge-Dash Notations |
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