Oxygen

Oxygen is a highly reactive nonmetallic element; it is a strong oxidizing agent with high electronegativity and forms O₂ at Standard Temperature and Pressure (STP).

An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula.

Oxygen is essential for all aerobic organisms; common medical uses include oxygen therapy, hyperbaric medicine, and space suits.

Ozone (O₃) is diamagnetic (its electrons are all paired) and is a powerful oxidant.