Question

The EAN of nickel in $Ni(CO{)}_4$ is:

• A. $36$
• B. $38$
• C. $28$
• D. $454$

Answer 1

The correct option is A $36$

EAN rule:-

The total number of $e^{-}s$ linked with the central metal atom or ion in a complex plus the $e^{-}s$ donated by the ligand is known as Effective Atomic Number, i.e; $EAN$. It is the attainment of noble gas configuration.

$EAN=Z-x+2nL$

$Z$= atomic number of the metal in the complex ion.

$x$= oxidation state of the central metal atom.

$n$= no. of ligands.

$L$= no. of coordinate bond formed by the ligand.

$\left[Ni\right(CO{)}_4\left]\right(EAN)=[28-0+2\times 4\times 1]$

$=28+8$

$=36$.