Unfortunately, B2Se3O2 is not a recognized chemical compound. We suggest you check the chemical formula of the substance you wish to study.
In chemistry, we use chemical formulas to represent the atomic composition of a compound. The chemical formula provides the number of atoms of each element in a molecule of the compound.
The chemical formula you provided, B2Se3O2, does not follow international rules for noting chemical compounds. It is possible that you have made some mistakes in writing or misunderstood the formula.
We recommend that you check the information you have. Please provide the correct chemical formula so that we can provide you with detailed information about the chemical compound you wish to learn about.