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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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