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Oxygen: Difference between revisions
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[[ | [[File:oxygen_molecule.png|200px|thumb|Diagram of the oxygen atom.]] | ||
'''Oxygen''' is the element with atomic number 8 and represented by the symbol O. It is a member of | '''Oxygen''' is the element with atomic number 8 and represented by the symbol O. It is a member of group 6 on the periodic table, and is a highly reactive nonmetallic period 2 element that readily forms compounds (notably oxides) with almost all other elements. At standard temperature and pressure two atoms of the element bind to form dioxygen, a colorless, odorless, tasteless diatomic gas with the formula O₂. | ||
Oxygen is the third most abundant element in the universe by mass after [[hydrogen]] and [[helium]] and the most abundant element by mass in the [[Earth]]'s crust. Oxygen constitutes 88.8% of the mass of water and 20.9% of the volume of air. Oxygen can form a covalent bond with two hydrogen atoms to create the compound [[water]], an essential to many life forms. The Lewis pair structure for this is H:O:H where each colon represents two valence electrons (electrons shared). | Oxygen is the third most abundant element in the universe by mass after [[hydrogen]] and [[helium]] and the most abundant element by mass in the [[Earth]]'s crust. Oxygen constitutes 88.8% of the mass of water and 20.9% of the volume of air. Oxygen can form a covalent bond with two hydrogen atoms to create the compound [[water]], an essential to many life forms. The Lewis pair structure for this is H:O:H where each colon represents two valence electrons (electrons shared). | ||
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