Calculate the EAN of K2[Zn(CN4)] and explain how?

Effective atomic number  = Z - oxidation state + 2 x Coordination number

Coordination number  = 4  (as 4 CN ligands are there)
Zn atomic number (Z) = 30
Oxidation state 
2 x 1 + x + 4 (-1) =0
x -2= 0
x = +2

Effective atomic number  = Z - oxidation state + 2 x Coordination number
                 = 30 - 2 + 2 (4)
                 = 36
 

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