Lewis Structures (w/ same formal charge but different bonds)

[Steven Garcia 1H]

Hi!

If a Lewis structure for an atom can be written two different ways having the same formal charge, is it ideal to use the Lewis structure that let's say has a triple bond compared to another Lewis Structure of the same atom (with the same formal charge) that has a double bond instead?

An example of what I'm referring to is example 49.e in Chapter 3. The CN^- can be written with either a double bond or a triple bond having the same formal charge either way.

[Diego Gonzalez 3F]

Since a double bond is more stable than a single bond, I believe the same logic applies. So I believe that a triple bond, if the formal charge is lowest it can be, would be preferable.

[Sara Sadrolsadat 1G]

In the case of (CN)^-, I don't believe it can be written as a double bond because that would result in a total electron count of 12, when the formula only accounts for 10 (C: 4e + N: 5e + (-): 1e). Even if a double bond could exist between the two atoms, the formal charge would be 3- and not the needed 1-.