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Questions  >>  SAT  >>  Chemistry  >>  Atomic Structure
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Q)

$Mg^{2+}$ is isoelectronic with

$\begin{array}{1 1}(a)\; Ca^{2+} \\ (b)\; Na^{+} \\ (c)\;Zn^{2+} \\ (d)\;Cu^{2+} \end{array} $

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A)
Solution :
isoelectronic species refers to the elements that have the same number of electrons.
Hence $Mg^{2+}$ and $Na^{+}$ have 10 electrons
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