How many of the following species have each metal reaching 18 valence electrons only when a metal-metal bond is counted? Mn₂(CO)₁₀, Fe(CO)₅, Co₂(CO)₈, Ni(CO)₄, Fe₂(CO)₉, Re₂(CO)₁₀, V(CO)₆, Cr(CO)₆

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Mn₂(CO)₁₀, Co₂(CO)₈, Fe₂(CO)₉ and Re₂(CO)₁₀ give 18 electrons per metal only with the M–M bond (for example Mn: 7 + 10 + 1 = 18). Fe(CO)₅, Ni(CO)₄ and Cr(CO)₆ already have 18 without any metal-metal bond, and V(CO)₆ has 17. Count = 4.

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