Be2+ is isoelectronic with which of the following ions? [2014]

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Solution

Q.
${Be}^{2 +}$ is isoelectronic with which of the following ions [2014]

1 $H^{+}$

2 ${Li}^{+}$

3 ${Na}^{+}$

4 ${Mg}^{2 +}$

Ans.
(2)

Species No. of electrons

${Be}^{2 +}$ 2

$H^{+}$ 0

${Li}^{+}$ 2

${Na}^{+}$ 10

${Mg}^{2 +}$ 10

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