Double and Triple Bonds

[Shuyi Yu 1B]

In a double or triple bond why is the region of electron density equal one instead of two or three?

[Lynsea_Southwick_2K]

The second rule of the VSEOR model is:

"Rule 2 There is no distinction between single and multiple bonds: a multiple
bond is treated as a single region of high electron concentration.

That is, the two electron pairs in a double bond stay together and repel other
bonds or lone pairs as a unit. The three electron pairs in a triple bond also stay
together and act like a single region of high electron concentration. For instance,
a carbon dioxide molecule, has a linear structure similar to that of
BeCl2, even though both bonds are double bonds"

This comes from the textbook, hope it helps a bit.

[Dong Hyun Lee 4E]

Any bond will be considered as a single electron region as it acts like one region together. Just because it is a triple or double bond does not make the bond act as three or two different electron regions.