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Oxygen is a chemical element; it has 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.
Jun 25, 2024 · Learn about oxygen, a nonmetallic element essential to living organisms and the most abundant in Earth's crust. Find out how oxygen was discovered, how it forms compounds and allotropes, and how it is used in various fields.
Learn about oxygen, a member of the chalcogen group and an essential element for life on Earth. Find out its chemical and physical properties, uses, isotopes, and allotropes with videos and quizzes.
Oxygen is a chemical element. It has the symbol O and atomic number 8. It is the third most common element in the universe, after hydrogen and helium. Oxygen is more than a fifth of the Earth's atmosphere by volume. In the air, two oxygen atoms usually join to make dioxygen (O 2), a colourless gas. This gas is often just called oxygen.
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.
May 21, 2015 · Learn about the discovery, history, isotopes, and uses of oxygen, the eighth element of the periodic table. Find out how oxygen supports life, forms compounds, and affects the atmosphere.
Sep 29, 2014 · Oxygen is the third most abundant element in the universe, according to the Thomas Jefferson National Accelerator Facility. However, its reactivity made it relatively rare in early Earth's...
