Answer:
Electronic
configuration of Be-atom = \[1{{s}^{2}},2{{s}^{2}}\]
M.O. electronic configuration of \[B{{e}_{2}}\]
Compare the relative stabilities
of the following species
\[=\sigma {{(1s)}^{2}}\overset{*}{\mathop{\sigma
}}\,{{(1s)}^{2}}\sigma {{(2s)}^{2}}\overset{*}{\mathop{\sigma
}}\,{{(2s)}^{2}}\]
\[\therefore \] Bond order \[=\frac{1}{2}(4-4)=0\]
Hence, \[B{{e}_{2}}\]does not
exist.
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