(D) The formula for Effective Atomic Number $(EAN)$ is: $EAN = Z - \text{oxidation state} + 2 \times \text{coordination number}$.For $Ni(CO)_4$:$Z$ (a

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(D) The formula for Effective Atomic Number $(EAN)$ is: $EAN = Z - \text{oxidation state} + 2 \times \text{coordination number}$.For $Ni(CO)_4$:$Z$ (atomic number of $Ni$) = $28$.Oxidation state of $Ni$ = $0$ (since $CO$ is a neutral ligand).Coordination number = $4$.$EAN = 28 - 0 + 2 \times 4 = 28 + 8 = 36$.