Chemical Bonding And Molecular Structure Ques 69
69. $Be^{2+}$ is isoelectronic with which of the following ions?
[2014]
(a) $H^{+}$
(b) $Li^{+}$
(c) $Na^{+}$
(d) $Mg^{2+}$
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Solution:
- (b) $Be^{2+}=(4-2)=2$
is isoelectronic with $Li^{+}$ (3-1=2)
Since both have the same number of electrons in their outermost shell.