Question

How do you count the vlanece electrons for for [Fe(CO)4]2-? I cannot figure out how to...

How do you count the vlanece electrons for for [Fe(CO)4]2-?

I cannot figure out how to get 16 or 18 using the donor pair method or the netural ligand method. For some reason I cannot figure out electron counting, depsite watching videos. In the exmplaes it all makes sense, until I try to do one on my own.
Anyways, using the donor pair method, the COs would contribute 2e- each, so 8e- total. Then iron would be in the -2 oxidation state beccause of the -2 charge, which puts us at 12e-, then subtract 2e- for the oxidation state, which puts us at 10e-, which I know is not right.

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