First slide

Atomic number, mass number, isotopes, isobars and isotones

Question

${Be}^{2 +}$ is isoelectronic with which of the following ions?

Easy

A

$H^{+}$
B

$L i^{+}$
C

$N a^{+}$
D

$M g^{2 +}$

Solution

$\begin{matrix} Species & No. of electrons \\ {Be}^{2 +} & 2 \\ H^{+} & 0 \\ {Li}^{+} & 2 \\ {Na}^{+} & 10 \\ {Mg}^{2 +} & 10 \end{matrix}$

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