Double bond

[Moris 1H]

How can we tell if one molecule's double bond is shorter than another molecule's double bond?

[Rebecca Chu 1C]

You look at the size of the atoms. Smaller atoms that have small radius (and in turn, shorter bond length) will have a stronger bond and therefore, be shorter. And if one of the molecules has resonance structures, the double bond would be longer on the molecule with resonance structures.

[Caroline Crotty 1D]

An easy way to remember this is to realize that as the number of electrons between two nuclei increases, bonds become shorter and stronger.

[MadelynNguyen1F]

If there are resonance structures for one of the molecules, then the double bond for that molecule will be longer than the double bond for the other.

[Alexis Bravo 1D]

The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length.

[Kelsey Li 3B]

To figure out the length of the bond, you look at the amount of bonded electrons. The higher the bonded electrons, the stronger the pull between the two atoms which means a shorter bond length.