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Oxygen
Beginning of essay
, symbol O, colorless, odorless, tasteless, slightly magnetic
gaseous element. On earth, is more abundant than any other element.
was discovered in 1774 by the British chemist Joseph Priestley and,
independently, by the Swedish chemist Carl Wilhelm Scheele; it was shown to be
an elemental gas by ....
Middle of essay
....weight of oxygen is 15.9994.Oxygen composes 21
percent by volume or 23.15 percent by weight of the atmosphere; 85.8
percent by weight of the oceans and, as a constituent of most rocks and minerals,
46.7 percent by weight of the solid crust of the earth. Oxygen comprises 60
percent of the human body. It is a constituent of all living tissues; almost all
plants and animals, including all humans, require oxygen, in the free or
combined state, to maintain life.3
Three structural forms of ox.... |
| Number of words: 752 |
Approximate pages: 3 |
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