Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium.
S 1317 (OTTO) Selenium, powder, GR 99%+ Cas 7782-49-2 - used with bismuth in brasses to replace more toxic lead. S 1317 (OTTO) Selenium, powder, GR 99%+ Cas 7782-49-2 - used in the ceramics and glass industries.