Discuss the struchure of `[Co(NH_3)_6]^(3+)` ion on the basis of valence bond theory. Whether it is an inner orbital or outer orbital complex ion ?

Explanation

Structure of `Co(NH_3)_6]^(3+)`. Here, Co is our central metal element. Configuration of Co (atom) is `[Ar]3d^74s^2`.
Configuration of `Co^(3+)` ion = `[Ar]3d^6`.i.e

`thereforeCo^(3+)` ion has 4 unpaird electrons in 3d-subshell and `NH_3` is a strong ligand.
`therefore` 3d-electrons go for pairing and configuration becomes:

Thus, `Co^(3+)" in "[Co(NH_3)_6]^(3+)` is in `d^2sp^3` (inner orbital octahendral complex) and is diamagnetic in nature due t0 absence of unpaired electrons