| Member | Definition | Role |
|---|
| beryllium chloride | A compound of beryllium (+2 oxidation state) and chloride in the ratio 1:2. | beryllium dichloride |
| beryllium fluoride | The fluoride salt of beryllium (+2 oxidation state). In the solid state it exists as a glass, with four-coordinate Be(2+) tetrahedral centres and two-coordinate fluoride centres. As a gas it adopts a linear triatomic structure and in the liquid state a fluctuating tetrahedral structure. In protein crystallography it is used as a mimic of phosphate. | beryllium difluoride |
| beryllium oxide | A beryllium molecular entity consisting of beryllium (+2 oxidation state) and oxide in the ratio 1:1. In the solid state, BeO adopts the hexagonal wurtzite structure form while in the vapour phase, it is present as discrete diatomic covalent molecules. | beryllium oxide |