Calculate EAN for Co $_{2}$ CO $_{8}$ ?

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Solution

EAN i.e Effective Atomic Number is nothing but the total number of electrons present on each atom in the given compounds.
The oxidation state of metal in metal carbonyl's is zero.
The structure of ${C o}_{2} {C O}_{8}$ is as shown above.
EAN i.e total number of electrons present on one Co atom is 27+1+8 =36 (no. of electrons per cobalt atom+ number of electrons shared between them + number of electrons given by ligands.

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