Which of the following system has maximum number of the unpaired electrons in an inner octahedral complex?

Options

A. `d^(4)`
B. `d^(9)`
C. `d^(7)`
D. `d^(5)`

Answer

1

Explanation

In an inner orbital complexes:
`d^(4) - t_(2g)^(4)e_(g)^(0)`, so two unapired electrons
`d^(9) - t_(2g)^(6)e_(g)^(3)`, so one unapired electrons
`d^(7) - t_(2g)^(6)e_(g)^(1)`, so one unapired electrons
`d^(5) - t_(2g)^(5)e_(g)^(0)`, so one unapired electrons