Question

# What is 'effective atomic number' (EAN)?Calculate the effective atomic number of the central metal atom in the following compounds:(a) $$K_4 Fe(CN)_6$$            (b) $$Cr(CO)_6$$     $$Fe (Z = 26)$$                     $$Cr (Z = 24)$$

Solution

## 'Effective atomic number' (EAN):It is the total number of electrons around the central metal ion present in  a complex and calculated as the sum of the electrons on the metal ion and the number of electrons donated by the ligands. It can be calculated using the formula$$\displaystyle EAN=Z-X+Y$$$$\displaystyle Z =$$ atomic number of the metal$$\displaystyle X =$$ number of electrons lost during the formation of the metal ion from its atom$$\displaystyle Y=$$ number of electrons donated by the ligands.(a)$$\displaystyle K_4 Fe(CN)_6$$$$\displaystyle Z = 26$$$$\displaystyle X = 2$$$$\displaystyle Y = 36$$$$\displaystyle EAN=Z-X+Y =26-2+12=36$$(b)$$\displaystyle Cr(CO)_6$$$$\displaystyle Z = 24$$$$\displaystyle X = 0$$$$\displaystyle Y = 12$$$$\displaystyle EAN=Z-X+Y =24-0+12=36$$Chemistry

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