What is the structure of BeCl2 molecule in gaseous and solid-state?
The gaseous/vapour state is different than the solid-state. The structure of BeCl2 in the solid-state is a polymeric chain structure. BeCl2 tends to form a chloro-bridged
dimer at temperatures below 1200K and dissociates into a linear monomer at high temperatures of the order of 1200 K.