If `(eta^(5)-C_(5)H_(5))" "M(C_(2)H_(4))_(2)` follows EAN rule, the central metal atom/ion would be :

EAN of [Fe(eta^(5)-C_(5)H_(5))(CO)_(2)CI]:

EAN of [Feeta^(2)-C_(5)H_(5))(CO)_(2)CI]:

Nickelocene, [Ni(eta^(5)-C_(5)H_(5))_(2)] is a bright green reactive solid conveniently prepared by adding a solution of NiCl_(2) in dimethyl sulphoxide to a solution to a of KC_(5)H_(5) in 1, 2 dimethoxyethane. What is the E.A.N of Ni in above complex ?

EAN of na [PtCI_(3)(eta^(2)-C_(2)H_(2))] is .