Question

Effective atomic number (EAN) of $\text{Mn}$ in $\left[\left(\text{Mn}\right)_{\text{2}} \left(\text{(CO)}\right)_{\text{10}}\right]$ is

• A. 36
• B. 35
• C. 72
• D. 40

Answer 1

Answer: (A)

In $\left[\left(\text{Mn}\right)_{\text{2}} \left(\text{(CO)}\right)_{\text{10}}\right]$ , there is one $\text{Mn} - \text{Mn}$ bond
Electron present in 2 Mn = 50
Electrons donated by 10 CO = 20
Electrons in one $\text{Mn} - \text{Mn}$ bond = 2
Total electrons = 72
So EAN per $Mn=\frac{72}{2}=36$ .