Following Sidgwick's rule of EAN,the formula | vedclass

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(C) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom should be equal to the atomic num

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$Co_2(CO)_8$

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(C) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom should be equal to the atomic number of the next noble gas.For $Co$ $(Z = 27)$,the next noble gas is $Kr$ $(Z = 36)$.In $Co_2(CO)_8$,there is a $Co-Co$ bond.Each $Co$ atom contributes $9$ electrons (valence electrons) + $8$ electrons from $4$ $CO$ ligands $(4 	imes 2 = 8)$ + $1$ electron from the $Co-Co$ bond.Total electrons per $Co$ atom = $9 + 8 + 1 = 18$ electrons in terms of valence shell,or $27 + 8 + 1 = 36$ as $EAN$.Thus,$Co_2(CO)_8$ follows the $EAN$ rule.

Following Sidgwick's rule of $EAN$,the formula of the metal carbonyl $Co(CO)_x$ is:

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