Argon: Difference between revisions
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imported>David Yamakuchi mNo edit summary |
imported>Robert W King No edit summary |
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Revision as of 18:41, 5 April 2008
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Argon (symbol, Ar) is a chemical element with atomic number 18. It is an inert gas of the eighteenth group of the modern periodic table. It is present in a small quantity in the earth's atmosphere. It owes its non-reactivity mainly to its completely filled outermost shell.