Question

The EAN of metal atoms in $\left[Fe\right(CO{)}_2\left(N{O}^{+}{)}_2\right]$ and $C{o}_2(CO{)}_8$ respectively are:

• A. 34, 35
• B. 34, 36
• C. 36, 36
• D. 36, 35

Answer 1

The correct option is C 36, 36

$EAN=Z-X+Y$
EAN=effective atomic number
Z=atomic number
X=number of electrons lost by metal
Y=Number of electrons donated by ligands.
For $\left[Fe\right(CO{)}_2\left(N{O}^{+}{)}_2\right]$, $EAN=26+2+8=36$
For $C{o}_2(CO{)}_8$, $EAN=27+0+9=36$