What is 'effective atomic number' (EAN)?
Calculate the effective atomic number of the central metal atom in the following compounds:
(a) $K_{4} F e (C N)_{6}$ (b) $C r (C O)_{6}$
$F e (Z = 26)$ $C r (Z = 24)$

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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
$E A N = Z - X + Y$
$Z =$ atomic number of the metal
$X =$ number of electrons lost during the formation of the metal ion from its atom
$Y =$ number of electrons donated by the ligands.
(a)
$K_{4} F e (C N)_{6}$
$Z = 26$
$X = 2$
$Y = 36$
$E A N = Z - X + Y = 26 - 2 + 12 = 36$
(b)
$C r (C O)_{6}$
$Z = 24$
$X = 0$
$Y = 12$
$E A N = Z - X + Y = 24 - 0 + 12 = 36$

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