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Which one of the following represents all isoelectronic species?
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The correct answer is:
$\mathrm{Ca}^{2+}, \mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-}$
(2) $\mathrm{Ca}^{2+}=20-2=18 \mathrm{e}^{-}$
$\begin{aligned} & \mathrm{Ar}=18 \mathrm{e}^{-} \\ & \mathrm{K}^{+}=19-1=18 \mathrm{e}^{-} \\ & \mathrm{Cl}^{-}=17+1=18 \mathrm{e}^{-}\end{aligned}$
So, $\mathrm{Ca}^{2+}, \mathrm{Ar}, \mathrm{K}^{+}$and $\mathrm{Cl}^{-}$are isoelectronic species.
$\begin{aligned} & \mathrm{Ar}=18 \mathrm{e}^{-} \\ & \mathrm{K}^{+}=19-1=18 \mathrm{e}^{-} \\ & \mathrm{Cl}^{-}=17+1=18 \mathrm{e}^{-}\end{aligned}$
So, $\mathrm{Ca}^{2+}, \mathrm{Ar}, \mathrm{K}^{+}$and $\mathrm{Cl}^{-}$are isoelectronic species.
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