The correct order of the number of unpaired electrons in the ions `Cu^(2+), Ni^(2+), Fe^(3+)`, and `Cr^(3+)`is

The correct order of number of unpaired electrons in the ions : 'Cu^((2+)), Ni^((2+)), Fe^((3+))' and 'C r^((3+))' is

The number of unpaired electrons in Ni^(2+) is

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

The number of unpaired electron in Ni^(2+) is

The number of unpaired electron in Ni^(2+) is

The number of unpaired electron in Cr^(+2) is

The number of unpaired electrons in Ni^(2+) is :