Answer
Cu: [Ar]4s$^{1}$3d$^{10}$
Cu$^{+}$: [Ar]4s$^{0}$3d$^{10}$
Cu$^{2+}$: [Ar]4s$^{0}$3d$^{9}$
Work Step by Step
Cu: [Ar]4s$^{1}$3d$^{10}$
Cu$^{+}$: [Ar]4s$^{0}$3d$^{10}$
Cu$^{2+}$: [Ar]4s$^{0}$3d$^{9}$
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