Question
Why do hydrides and halides of Be polymerise?
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Answer
Since, $\mathrm{BeH}_2$ and $\mathrm{BeCl}_2$ have only four electrons in the valence shell, therefore, they are electron deficient molecules. To make up their electron deficiency, each Be atom forms four, three-centre twoelectron bonds or banana bonds. Thus, it is due to electron deficiency that $\mathrm{BeH}_2$ and $\mathrm{BeCl}_2$ have polymeric structures.
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