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Q.
How many of the following species are diamagnetic? $He _{2}^{+}, H _{2}, H _{2}^{+}, H _{2}^{-}, He$
TS EAMCET 2019
Solution:
According to molecular orbital theory, species with all paired electrons in their electronic configuration are diamagnetic in nature.
$ He _{2}^{+} \rightarrow$ Has total $3$ electrons, thus it contains one unpaired electron and is paramagnetic in nature.
$H _{2} \rightarrow$ Has total $2$ electrons, thus it contains all paired electrons and is diamagnetic in nature.
$H _{2}^{+} \rightarrow$ Has only $1$ electron, thus it is paramagnetic in nature.
$H _{2}^{-} \rightarrow$ Has total $3$ electrons, thus it contains one unpaired electron and is paramagnetic in nature.
$He \rightarrow$ Contains total two $(2)$ electrons and has no unpaired electron, thus is diamagnetic in nature. Hence, among the given species, we have only two of them which are diamagnetic and thus,