The effective atomic number of `Co(CO)_(4)` is 35 and hence is less stable. It attains stability by

The effective atomic number of Fe in Fe(CO)_(5) is

The effective atomic number of Fe in Fe(CO)_(5) is

The effective atomic number of Fe in Fe(CO)_5 is

Effective atomic number of Fe in Fe_(2)(CO)_(9) is

Effective atomic number of Fe in Fe_(2)(CO)_(9) is

On the basis of stability of complex extity in the solution, complexes may be of two types, perfect, imperfect complexes, the stabilies depends upon the extent of dissociation which in turn depends on the strength of M-L band. The dissociation of complex may be expressed [ML_(x)P^(+)hArrMy^(+)+xL and eq. constant of this dissociation equilibrium is called instability constant. The stability of complex depends are EAN, charge on central atom, basic nature chelation, nature of metal ion and ligand acc. to HSAB principle The EAN of Co in Co(CO)_(4) is 35. Hence it is less stable. It attains stability by

Effective atomic number of Fe in [Fe(CO)_(4)]^(-) is :

The value of effective atomic number of Ni in [Ni(CO_(4))] is