what is oxygen???
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Answer:
Oxygen is a colourless, odourless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere.
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O
2. Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides.[2]
Oxygen, 8O
A transparent beaker containing a light blue fluid with gas bubbles
Liquid oxygen boiling
Oxygen
Allotropes
O2, O3 (ozone)
Appearance
gas: colorless
liquid and solid: pale blue
Standard atomic weight Ar, std(O)
[15.99903, 15.99977] conventional: 15.999
Abundance
in the Earth's crust
461000 ppm