`[Cr(NH_(3))_(6)]^(3+)` is an ____________ orbit complex and _______ in nature.

[Co(NH_3)_6]^(3+) is an............. orbital complex and is............. in nature.

The complex [Co(NH_(3))_(6)]^(3+) is an inner orbital complex whereas the [CoF_(6)]^(3-) is an outer orbital complex. The number of unpaired electrons in these two complexes are respectively :

Explain [Co(NH_(3))_(6)]^(3+) is an inner orbital complex whereas [Ni(NH_(3))_(6)]^(2+) is an outer orbital complex.