MCQ
$Be^{2+}$ is isoelectronic with which of the following ions?
- A$H^+$
- ✓$Li^+$
- C$Na^+$
- D$Mg^{2+}$
✓
Answer
Correct option: B.
$Li^+$
b
Isoelectronic species contain same number of electrons. $B e^{2+}$ contains $2$ electrons. Among the given options, only $L i^{+}$ contains $2$ electrons and therefore, it is isoelectronic with $B e^{2+}$ $H^{+} \rightarrow$ no eletron $N a^{+} \rightarrow 10 e^{-}$
Isoelectronic species contain same number of electrons. $B e^{2+}$ contains $2$ electrons. Among the given options, only $L i^{+}$ contains $2$ electrons and therefore, it is isoelectronic with $B e^{2+}$ $H^{+} \rightarrow$ no eletron $N a^{+} \rightarrow 10 e^{-}$
$L i^{+} \rightarrow 2 e^{-}$
$M g^{2+} \rightarrow 10 e^{-}$
Hence, $B e^{2+}$ is isoelectronic with $L i^{+}$
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