Back Seleen Afrikaans ሴሊኒየም Amharic Selenio AN सेलेनियम ANP سيلينيوم Arabic سيلينيوم ARY سيلينيوم ARZ Seleniu AST सेलेनियम AWA Selen Azerbaijani
Selenium is a chemical element. Its chemical symbol is Se and its atomic number is 34. It has 34 protons and 34 electrons and a mass number of 78.96.