# How does resonance fail in approximating chemical structures?

In the book "Concise Inorganic Chemistry" by Prof. JD Lee, it says here:

These contributing structures do not actually exist. The $$\ce{CO3^2-}$$ does not consist of a mixture of these structures, nor is there an equilibrium between them. The true structure is somewhere in between and is called a resonance hybrid. Resonance was widely accepted in the 1950s but is now regarded at best as clumsy and inadequate, and at worst as misleading or wrong!

I want to know where exactly does resonance fail in approximating the structures?

• – Martin - マーチン Oct 2 at 13:03
• The fact that the resonant structure aren't real at most clean up a misunderstanding of the theory not really why it might not be a very good model (which is case is, there is no need to overemphasises pros and cons). MO theory might be conceptually more elegant and correct by principle. However computational chemists still working on the wavefunctions of hydrogenoid systems such as HH+ ! – Alchimista Oct 4 at 11:31