Which complex follows the Sidgwick EAN rule ( | vedclass

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(B) According to Sidgwick's $EAN$ rule,the Effective Atomic Number $(EAN)$ of the central metal atom/ion should be equal to the atomic number of the n

Vedclass · Accepted Answer

$[M(CO)_6]$

Vedclass · Answer

(B) According to Sidgwick's $EAN$ rule,the Effective Atomic Number $(EAN)$ of the central metal atom/ion should be equal to the atomic number of the nearest noble gas (which is $36$ for $3d$ series metals like $Cr$,$Z = 24$).Formula: $EAN = Z - O.S. + 2 	imes (C.N.)$For $[M(CO)_6]$:Atomic number $(Z)$ = $24$Oxidation state $(O.S.)$ = $0$ (since $CO$ is a neutral ligand)Coordination number $(C.N.)$ = $6$$EAN = 24 - 0 + 2 	imes 6 = 24 + 12 = 36$Since $36$ is the atomic number of Krypton $(Kr)$,$[M(CO)_6]$ follows the $EAN$ rule.

Which complex follows the Sidgwick $EAN$ rule (where atomic number of $M = 24$)?

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