Question

The hybridisation of Be (in $Be{H}_2$) in its dimer is ____ and in polymeric form is ____.

Answer 1

The total bonds around each Be in its dimer form are $3$, which results in $s{p}^2$ hybridisation and planar geometry. But in its polymeric forms, each Be atom has four bonds around them resulting in $s{p}^3$ hybridisation.