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Oxygen can be found in in metals, water, and even the one thin that protects us from the powerful sunrays. Oxygen is a very unstable element, which makes it easy to make compounds with other elements creating different kinds of solids and liquids. Oxygen is found in the air as O2, and found in the ozone as O3. Oxygen is essential to all planets' life.
The Discovery of Oxygen
On August 1, 1774, Joseph Priestly examined the effect of intense heat on mercuric oxide. He noted that an air or gas was readily expelled from the specimen. To his surprise a candle burned in this with a remarkably vigorous flame...
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