Question

Calculate oxidation number of central atom in $\left[Fe\right(CO{)}_5]$.

Answer 1

1) The oxidation number of Fe is $0$.

2) The charge on a complex is the sum of the oxidation state of the metal center and the charges on the ligands.

3) $CO$ is a neutral ligand. Hence, the charge on the ligand is$0$. The total charge on the complex is also $0$.

4) Calculate the oxidation number of Fe in the complex, $Fe(CO{)}_5$ is as follows;

( Charge on$Fe$) $+5$(Charge on $CO)=0$

( Charge on Fe) $+5\left(0\right)=0$

( Charge on Fe)$=0$

5)Thus, the oxidation number of Fe in$Fe\left(CO\right)5$is $0$.