Oxygen, a colorless, odorless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide;. It is a member of the chalcogen group in the periodic table.
Visit crime time for breaking crime news and listen to the martinis & murder podcast.. Singlet oxygen is the common name used for the two metastable states of molecular oxygen (o2) with higher energy than the ground state triplet oxygen.