Q56 / 180 · NEET 2014 · Chemistry

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

A
$H^{+}$
Correct answer
B
$L i^{+}$
C
$N a^{+}$
D
$M g^{2 +}$

Solution

Isoelectronic species are those species that have the same number of electrons.

${}_{4}{Be}^{2 +} = 1 s^{2} = 2 e^{-}$

${}_{3}{Li}^{+} = 1 s^{2} = 2 e^{-}$

Hence, the correct answer is option: 'B'.

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