Question

EAN of a central atom in a complex = Atomic number of the central atom (Z) - (oxidation number of the central atom with sign) + number of electrons collected from the ligrands. What is the meaning of "number of electrons collected from the ligrands"?

Answer 1

EAN number is a number of electrons around the central metal atom given by the ligand.

EAN=Z-oxidation number of central atom + number of electron collected from the ligand.

Example:

Consider the complex $K_3\left[Fe\right(CN{)}_6]$

Here, oxidation state of $Fe$ is +3 and $Z=26$

Here $CN$ is a monodentate ligand and donate only one electron pair.

Now there are 6 $CN$ groups. Thus the total number of electron donated by the $CN$ to the central atom$6\times 2=12$

Now, $EAN=26-3+12=35$