Selenium is a chemical element with the atomic number 34, and is represented by the chemical symbol Se, and has an atomic mass of 78.96. It is a nonmetal. This article about Chemistry is a stub. You can help Chemistry by expanding it. Retrieved from "https://chemistry.fandom.com/wiki/Selenium?oldid=8165" Categories: Article stubs Elements Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.