11th Class Chemistry Chemical Bonding and Molecular Structure

  • question_answer 39)
    Use molecular orbital theory to explain why the \[B{{e}_{2}}\] molecule does not exist?


    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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