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Oxygen
Beginning of paper
about
is a Group 16 element. is the third most abundant
element found in the sun, and it plays a part in the carbon-nitrogen cycle,
one process responsible for stellar energy production. in excited
states is responsible for the bright red and yellow-green colours of the
aurora. The atmosphere of Mars contains about 0.15% oxygen. Abou .... Middle of paper
.... reactive and capable of combining with most elements.
It is essential for respiration of all plants and animals and for
practically all combustion.
history of oxygen
Leonardo da Vinci suggested that air consists of at least two
different gases. Before then, air was felt to be an element in its own
right. He was also aware that one of these gases supported both flames and
life. Oxygen was prepared by several workers before 1772 but th ....
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Number of words: 954
Number of pages: 4 (approx. 250 words per double-spaced page)
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