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en.wikipedia.org/wiki/Oxygen

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 ...

www.livescience.com/28738-oxygen.html

Facts About Oxygen. By Stephanie Pappas 29 September 2014. ... Oxygen has eight total electrons — two orbit the nucleus in the atom's inner shell and six orbit in the outermost shell. The ...

www.thoughtco.com/oxygen-facts-606572

Atomic oxygen, which is also called "singlet oxygen" does occur in nature, although the ion readily bonds to other elements. Singlet oxygen may be found in the upper atmosphere. A single atom of oxygen usually has an oxidation number of -2. Oxygen supports combustion. However, it is not truly flammable! It is considered an oxidizer.

www.rsc.org/periodic-table/element/8

Oxygen accounts for about 23% of the atmosphere's mass with pairs of oxygen atoms stuck together to make dioxygen molecules, but it's not just in the air, we breathe. Overall, it's the most abundant element on the earth's surface and the third most abundant in the universe after hydrogen and helium.

www.thoughtco.com/fun-oxygen-facts-for-kids-3975945

Approximately 2/3 of the mass of the human body is oxygen because oxygen and hydrogen make up water. This makes oxygen the most abundant element in the human body, by mass. There are more hydrogen atoms in your body than oxygen atoms, but they account for very little mass.

www.britannica.com/science/oxygen

Oxygen, a colorless, odorless, 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 forms compounds by reaction with practically any other element.

www.sciencekids.co.nz/sciencefacts/chemistry/oxygen.html

Oxygen is a very reactive element that easily forms compounds such as oxides. Under standard temperature and pressure conditions two oxygen atoms join to form dioxygen (O 2), a colorless, tasteless and odorless gas. Oxygen is essential to human life, it is found in the air we breathe and the water we drink (H 2 0).

factslegend.org/15-surprising-oxygen-facts-you-probably-didnt-know

Surprising Oxygen Facts You Must Know: 11-15. 11. Oxygen is a non-metallic element. But of all non-metallic elements, it is actually the most reactive. 12. Cold water has more dissolved oxygen than warm water. This is why polar oceans have more oxygen dissolved in them than normal oceans and seas. 13.

education.jlab.org/itselemental/ele008.html

Oxygen can also be combined with acetylene (C 2 H 2) to produce an extremely hot flame used for welding. Liquid oxygen, when combined with liquid hydrogen , makes an excellent rocket fuel. Ozone (O 3 ) forms a thin, protective layer around the earth that shields the surface from the sun's ultraviolet radiation.

www.chem4kids.com/files/elements/008_speak.html

Oxygen is the eighth element of the periodic table and can be found in the second row (period). Alone, oxygen is a colorless and odorless molecule that is a gas at room temperature. Oxygen molecules are not the only form of oxygen in the atmosphere; you will also find oxygen as ozone (O 3 ) and carbon dioxide (CO 2 ).