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Argon

Argon is a chemical element in the periodic table.

It has the symbol Ar and atomic number 18.

The third noble gas, in group 18, argon makes up about 1% of the Earth's atmosphere, making it the most common noble gas on Earth.

Note:   The above text is excerpted from the Wikipedia article "Argon", which has been released under the GNU Free Documentation License.
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September 1, 2015

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