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Question

(A) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom in a complex is equal to the atom

Vedclass · Accepted Answer

$K_4[Fe(CN)_6]$

Vedclass · Answer

(A) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom in a complex is equal to the atomic number of the next noble gas.For $K_4[Fe(CN)_6]$:Atomic number of $Fe = 26$.Oxidation state of $Fe = +2$.Number of electrons lost $= 2$.Number of electrons gained from $6$ ligands $(CN^-)$ $= 6 	imes 2 = 12$.$EAN = (26 - 2) + 12 = 36$.Since $36$ is the atomic number of $Krypton$ $(Kr)$,it follows the $EAN$ rule strictly.

Pick out the complex compound in which the central metal atom obeys the $EAN$ rule strictly.

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