B e 2 + is isoelectronic with which of the following ions?

B e^{2 +}

is isoelectronic with which of the following ions?

$H^{+}$
$L i^{+}$
$N a^{+}$
$M g^{2 +}$

Solution

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

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

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

Asked in: NEET 2014

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