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15) Which, if any, is the ground-state electron configuration for Cr3+? A) [Ar]3d4 or 1s22s22p63s23p63d4 B) [Ar]3d3 or 1s22s22p63s23p63d3 C) None of the above D) [Ar]3d2 or 1s22s22p63s23p63d2 E) [Ar]3p 3 or 1s22s22p63s23p3