Chapter 23 - Transition Metals Chemistry and Coordination Compounds - Questions & Problems - Page 1021: 23.5

The electronic configurations of the following ions are: $V^{5+} = [Ar]3d^{0}4s^{0}$ $Cr^{3+} = [Ar]3d^{2}4s^{0}$ $Mn^{2+} = [Ar]3d^{5}4s^{0}$ $Fe^{3+} = [Ar]3d^{5}4s^{0}$ $Cu^{2+} = [Ar]3d^{9}4s^{0}$ $Sc^{3+} = [Ar]3d^{0}4s^{0}$ $Ti^{4+} = [Ar]3d^{0}4s^{0}$

The electronic configurations of the following ions are: $V^{5+} = [Ar]3d^{0}4s^{0}$ $Cr^{3+} = [Ar]3d^{2}4s^{0}$ $Mn^{2+} = [Ar]3d^{5}4s^{0}$ $Fe^{3+} = [Ar]3d^{5}4s^{0}$ $Cu^{2+} = [Ar]3d^{9}4s^{0}$ $Sc^{3+} = [Ar]3d^{0}4s^{0}$ $Ti^{4+} = [Ar]3d^{0}4s^{0}$