(Answered) Explain carefully and clearly why the energy of the 4s

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Explain carefully and clearly why the energy of the "4s" subshell is lower in energy than the "3d" subshell in the energy level diagram for C(g); whereas the "4s" subshell is higher in energy than the "3d" subshell in the energy level diagram for C+5(g). Necessary sketches used to facilitate your analysis - must be carefully explained.

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