Subjective Type

Use molecular orbital theory to explain why $$ \displaystyle Be_{2} $$ molecule does not exist.

Solution

$$\displaystyle Be_2 $$ molecule has MO electronic configuration $$\displaystyle KK (\sigma s)^2(\sigma ^* 2s)^2 $$.

The bond order is $$\displaystyle \frac {2-2}{2} = 0$$.

Zero bond order indicates that $$\displaystyle Be_2$$ molecule does not exists.

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