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METALS
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Oxygen
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<h1>
Oxygen is a chemical element with symbol O and atomic number 8. It is a
member of the chalcogen group on the periodic table and is a highly
reactive nonmetallic element and oxidizing agent that readily forms
compounds (notably oxides) with most elements.[3] Photosynthesis
releases oxygen, and respiration consumes oxygen. Changes in
phosphate[clarification needed] are related to changes in oxygen
concentrations. Oxygen was discovered independently by Carl Wilhelm
Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in
Wiltshire, in 1774, but Priestley is often given priority because his
work was published first. The name oxygen was coined in 1777 by Antoine
Lavoisier,[5] whose experiments with oxygen helped to discredit the
then-popular phlogiston theory of combustion and corrosion.
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