Oxygen
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Oxygen has the chemical symbol O, and is one of the gases found in the air we breathe in. It is colourless, odourless (it does not smell) and invisible (you cannot see it).
Not only people, but all animal life needs oxygen to live. When we breathe in, air goes into our lungs, and the oxygen goes into our blood (the bloodstream). On Earth, air is approximately 21% oxygen. Oxygen is produced by plants and trees. Helped by the sun, they take in carbon dioxide to give out oxygen through their leaves.
Oxygen was first noticed and studied by a scientist named Lavoisier. Its atomic mass is 15.994 but is estimated to be 16, and its atomic number is 8. There are also 8 Neutrons, Protons, and Electrons. The boiling point of Oxygen is -182.92 C. The melting point is -218.79 C. A Period Table of Elements tells what the atomic mass, chemical symbol and atomic number of all elements is. This gas is a diatomic, with the formula O2.
Ozone, the layer around the Earth that protects from the sun, is made by three oxygen atoms together, becoming O3. It is poisonous to breathe.
When an oxygen atom gets together with 2 hydrogen atoms, it becomes H2O,Water. Water is another thing that all animals need to live.
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