Question

WHY HALIDES OF BE ARE POLIMERIC

Answer 1

Metal halides are compounds betweenmetals and halogens. Some, such assodium chloride are ionic, while others are covalently bonded. Covalently bonded metal halides may be discrete molecules, such as uranium hexafluoride, or they may form polymeric structures, such aspalladium chloride.

Answer 2

All halides of Be are covalent and electron deficient. Because of this, they are unstable. So, in order to attain stability they polymerise to make long chains. They do this by forming coordinate bonds (dative covalent bonds) between lone pairs on halide atoms and adjacent beryllium atoms.