Argon: Difference between revisions
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imported>Milton Beychok (Added some info and also a references section) |
imported>Milton Beychok (Minor copy edit) |
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{{Elem_Infobox | {{Elem_Infobox | ||
|elName=Argon | |elName=Argon | ||
|eltrnCfg= | |eltrnCfg=1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup> | ||
|elgroup=18 | |elgroup=18 | ||
|elperiod=3 | |elperiod=3 | ||
Revision as of 01:52, 29 April 2011
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Argon is a chemical element, having the chemical symbol Ar. Its atomic number (the number of protons) is 18. It has a standard atomic weight of 39.948 g•mol −1, and is typically found as a gas in its elemental form.
Argon is considered a member of the "Nobel gas" class of element. At a pressure of 101.325 kPa, it has a boiling point −185.85 °C, and a melting point of −189.35 °C. It is the third most common gas in the Earth's atmosphere, at 0.934% by volume.[1]
References
- ↑ The Atmosphere From the website of the National Oceanic and Atmospheric Administration (NOAA) and the National Weather Service (NWS), Last updated May 5, 2009