The number of unpaired electrons in ferrous ion is

The number of unpaired electrons in Cr^(3+) ion is_____

The electronic configuration of Re^(3+) is (Xe)4f^(14)5d^(4) , the number of unpaired electrons in this ion is ____________.

The electronic configuration of Re^(3+) is (Xe)4f^(14)5d^(4) , the number of unpaired electrons in this ion is ____________.

Number of unpaired electrons in Fe^(2+) ion is

The number of unpaired electrons in Fe^(+) ion are

The number of unpaired electrons in Fe^(3+) ion are