####46. $Be^{2+}$ is isoelectronic with which of the following ions?
[2014]
(a) $H^{+}$
(b) $Li^{+}$
(c) $Na^{+}$
(d) $Mg^{2+}$
is isoelectronic with $Li^{+}(3-1=2)$
Since both have same number of electrons in their outermost shell.
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