Question
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
$\mathrm{Rb}^{+}$
$\mathrm{Rb}^{+}$
✓
Answer
$\mathrm{Rb}^{+}$ion has $37-1=36$ electrons. Thus, the species isoelectronic with it will also have 36 electrons. Some of its isoelectronic species are $\mathrm{Br}^{-}$ion ( $35+1=36$ electrons), Kr ( 36 electrons), and $\mathrm{Sr}^{2+}$ ion $(38-2=36$ electrons).
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