ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Oxygen gas in gas jar. Oxygen gas (O2) is a colourless, odourless and tasteless element 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.
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