It's called cyanosis
oxygen
Ozone is a tri oxygen molecule. It is formed in a natural process by the action of UV light on oxygen molecule. It is an allotrope of oxygen.
Oxygen
Exposing flesh to oxygen :D
The two abnormal noble gases will be xenon and krypton. Noble gases are generally chemically inert at S.T.P. However, xenon and krypton react with electronegative elements like fluorine and oxygen forming fluorides and oxyfluorides.
Cyanosis. Bluish discolorationof the skin indicates diminished oxygen content of blood.
When it gets cold out side and someone breathes and sees their breath they are viewing oxygen. They see it do to the particles of moisture in the air and the cold verses hot air.
abnormal
Syncope is a loss of consciousness or fainting, sometimes caused by lack of oxygen to the brain, but is different to Epilepsy. Seizures in Epilepsy are caused by abnormal electrical activity in the brain. So Syncope would not be a cause of seizures.
Hypoxia
Clear
Oxygen is a chemical element. Such properties of oxygen as its appearance and freezing point are determined by the arrangement of electrons in shells around the nucleus.
This is generally believed to be due to the appearance of life on earth in the form of stromatolites, a type of cyanobacteria (blue-green algae). These converted carbon dioxide to oxygen by the process of photosynthesis.
oxidation is caused with the addition of an oxygen atom
Oxygen
Not visible as a gas Very pale blue as a liquid
it will burn up