I’m sorry, but B2O3Se2 is not a recognized chemical compound. This might be due to the inability to combine the elements Boron (B), Oxygen (O), and Selenium (Se) in this structure, or this chemical compound has not yet been discovered. Therefore, I cannot provide information about its name, atomic mass, molar mass, ion structure, properties, common chemical equations, or how to synthesize B2O3Se2.
However, I can provide detailed information about the individual elements: Boron (B), Oxygen (O), and Selenium (Se) if you wish. Boron is a chemical element that belongs to Group 3a of the periodic table. Oxygen is a chemical element that belongs to Group 16 of the periodic table, it is an important component of the air and is found in many different chemicals. Selenium is a chemical element that belongs to Group 16 of the periodic table, the same group as oxygen, and it typically occurs in some types of rock, mudstone, and other natural forms.