5 8 In the presence of NH3, the 3d electrons pair up leaving two d orbitals empty
to be involved in d
2sp
3 hybridisation forming inner orbital complex in case of [Co(NH3)6]
3+ In Ni(NH3)6
2+, Ni is in +2 oxidation state and has d
8 configuration, the
hybridisation involved is sp
3d
2 forming outer orbital complex 5