Match the following atoms/ions with their correct electronic configurations:
Atom/Ion Electronic Configuration $(1) \ Cu$ $(A) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}$ $(2) \ Cu^{2+}$ $(B) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^2$ $(3) \ Zn^{2+}$ $(C) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^1$ $(4) \ Cr^{3+}$ $(D) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^9$ $(E) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^3$
| Atom/Ion | Electronic Configuration |
| $(1) \ Cu$ | $(A) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}$ |
| $(2) \ Cu^{2+}$ | $(B) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^2$ |
| $(3) \ Zn^{2+}$ | $(C) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^1$ |
| $(4) \ Cr^{3+}$ | $(D) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^9$ |
| $(E) 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^3$ |
(C) The correct matches are:
$(1) \ Cu (Z=29): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^1 \rightarrow (C)$
$(2) \ Cu^{2+} (Z=29): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^9 \rightarrow (D)$
$(3) \ Zn^{2+} (Z=30): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10} \rightarrow (A)$
$(4) \ Cr^{3+} (Z=24): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^3 \rightarrow (E)$
Thus,the correct sequence is $(1-C, 2-D, 3-A, 4-E)$.
$(1) \ Cu (Z=29): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10}, 4s^1 \rightarrow (C)$
$(2) \ Cu^{2+} (Z=29): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^9 \rightarrow (D)$
$(3) \ Zn^{2+} (Z=30): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^{10} \rightarrow (A)$
$(4) \ Cr^{3+} (Z=24): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^3 \rightarrow (E)$
Thus,the correct sequence is $(1-C, 2-D, 3-A, 4-E)$.
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