Sorry, but at present there is no information about the chemical substance with the formula Se5Br5. You may have entered the formula incorrectly or this substance has not yet been discovered or does not exist. Se and Br are the atomic symbols for Selenium and Bromine. You should check the formula again or refer to other reliable sources to ensure the accuracy of the information. You can also refer to information about individual chemical elements such as Selenium and Bromine to better understand their properties and reactions.