# Stability of complexes based on number of rings [duplicate]

$$\ce{[Co(edta)]^-}$$ has 5 rings in total and in $$\ce{[Co(en)_3]^{3+}}$$, there are 3 rings. The stability of the former is more than that of the latter. The reason I was told was that a complex with more number of rings is more stable.

Why is this so?

• May 9, 2021 at 16:17