Oxygen molecule 插畫檔

Oxygen molecule, computer artwork. Molecular model of an oxygen molecule (O2). Two oxygen atoms (red) are joined together. Oxygen is a colourless, odourless gas and is part of the chalcogen group. It makes up one fifth of the Earth's atmosphere. Oxygen is extremely reactive, forming oxides of most elements. It is essential for respiration of all plants and animals and for most types of combustion.