Written below are the electron configurations of of five different atomic species: A: 1s²2s22p63s1 B: 1s²2s²2p3 C: 1s²2s22p63s23p63d10 D: E: 1s²2s²2p 3s23p64s²3d¹04p4 Which configuration is representative of a transition metal cation? D B E OC 1s22s22p63s23p64s23d10

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