Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third-most …
Liquid oxygen, temporarily suspended in a magnet owing to its paramagnetism
Oxygen discharge (spectrum) tube
Oxides, such as iron oxide or rust, form when oxygen combines with other elements.