What is 18-ELECTRON RULE?

A rule used to predict formula for stable metal complexes. Valence shells of transition metals have 9 orbitals which can accomodate 18 electrons. Metal complex with 18 electrons has electron stability of noble gas.

18-ELECTRON RULE: "Well-known examples of 18 electron rule include ferrocene, iron pentacarbonyl, chromium carbonyl, and nickel carbonyl."

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