Question

Calculate EAN of $\left[Fe\right(CO{)}_5]$.

Answer 1

Let oxidation no. of $Fe=xx+(5\times 0)=0x=0.$

$EAN=(z-x)+2nL⟶\left(1\right)$ where $z=\text{Atomic number of metal}x=\text{Oxidation state of metal}n=\text{No. of Ligands}L=\text{No. of co-ordinate bonds formed by ligand.}$

For $\left[Fe{\left(CO\right)}_5\right]z=26,n=1,L=5.$

On substituting, in $\left(i\right)$

$EAN=(28-0)+(2\times 1\times 5)=36$