A) \[H_{2}^{+}\]
B) \[{{O}_{2}}\]
C) \[L{{i}_{2}}\]
D) \[He_{2}^{+}\]
Correct Answer: C
Solution :
Molecules or ions having no unpaired electrons are diamagnetic, e.g., \[L{{i}_{2}}=6{{e}^{-}}=\sigma 1{{s}^{2}},\,\,\overset{*}{\mathop{\sigma }}\,1{{s}^{2}},\,\,\sigma 2{{s}^{2}}\]
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