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Match the following with their condensed electronic configuration:

$\begin{array} {ll} \text{Element} & \text{Electron Configuration}\\ (1)\; Cr^{2+} & a.\;[Ar]3d^9 \\ (2) \; Zn^{2+} & b.\;[Ar]3d^7 \\ (3) \;Ni^{3+} & c.\; [Ar]3d^{10}\\ (4) \; Cu^{2+} & d.\;[Ar]3d^4 \end{array}$

$\begin {array} {1 1} (1) \rightarrow b\; \quad (2) \rightarrow c \; \quad (3) \rightarrow d\; \quad (4) \rightarrow c \\ (1) \rightarrow d\; \quad (2) \rightarrow c \; \quad (3) \rightarrow b\; \quad (4) \rightarrow a \\ (1) \rightarrow d\; \quad (2) \rightarrow b \; \quad (3) \rightarrow a\; \quad (4) \rightarrow c \\ (1) \rightarrow c\; \quad (2) \rightarrow a \; \quad (3) \rightarrow d\; \quad (4) \rightarrow b\end {array}$

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