Chemistry » Chemical Bonding » Molecular Structure and Polarity

Molecular Structure and Polarity

Introducing Molecular Structure and Polarity

Thus far, we have used two-dimensional Lewis structures to represent molecules. However, molecular structure is actually three-dimensional, and it is important to be able to describe molecular bonds in terms of their distances, angles, and relative arrangements in space (see the figure below).

A bond angle is the angle between any two bonds that include a common atom, usually measured in degrees. A bond distance (or bond length) is the distance between the nuclei of two bonded atoms along the straight line joining the nuclei. Bond distances are measured in Ångstroms (1 Å = 10–10 m) or picometers (1 pm = 10–12 m, 100 pm = 1 Å).

Molecular Structure and Polarity

Bond distances (lengths) and angles are shown for the formaldehyde molecule, H2CO.

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