![]() Although there are more hydrogen atoms in the body than oxygen atoms, they account for significantly less mass. This makes it the most abundant element, by mass, in the body. Much of that oxygen is part of water, H 2O. Approximately 2/3 of the mass of the human body is oxygen.Oxygen is paramagnetic, which means it is weakly attracted to a magnet but doesn't retain permanent magnetism.Oxygen supports combustion. However, it is not truly flammable! It is considered an oxidizer.A single atom of oxygen usually has an oxidation number of -2. ![]() Singlet oxygen may be found in the upper atmosphere. Ozone, O 3, is another form of pure oxygen. Atomic oxygen, which is also called "singlet oxygen" does occur in nature, although the ion readily bonds to other elements. Oxygen gas normally is the divalent molecule O 2.The atoms readily gain electrons and form covalent chemical bonds. The solid form is brittle rather than malleable or ductile. Oxygen is a nonmetal. It has low thermal and electrical conductivity, but high electronegativity and ionization energy. ![]()
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