(i) Cr⁺³ (ii) Pm⁺³ 

The electronic configuration of the given elements in their respective oxidation states are:

(i) Cr⁺³ : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³

Or, [Ar]¹⁸ 3d³

(ii) Pm⁺³ : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f⁴

Or, [Xe]⁵⁴ 4f⁴