Argon: Difference between revisions
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imported>Howard J. Wilk (monatomic, noble not Nobel) |
imported>Mark Widmer (Opening text revised to match new standard: Typical elemental phase (gas/liq/sol), symbol, Z, standard atomic weight. Added that atmospheric contribution is for dry air.) |
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'''Argon''' is a [[Chemical elements|chemical element]], typically found as a [[gas]] in its elemental form. It has the [[chemical symbol]] Ar, [[atomic number]] (number of [[protons]]) ''Z'' = 18, and a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 39.948 g•mol<sup> −1</sup>. | |||
Argon is a monatomic noble gas. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] −185.85 °[[Celsius (unit)|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 for dry air (0% [[humidity]]).<ref>[http://www.srh.noaa.gov/srh/jetstream/atmos/atmos_intro.htm The Atmosphere] From the website of the [[National Oceanic and Atmospheric Administration]] (NOAA) and the [[National Weather Service]] (NWS), Last updated May 5, 2009</ref> | |||
Argon is a monatomic noble gas. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] −185.85 °[[Celsius (unit)|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.<ref>[http://www.srh.noaa.gov/srh/jetstream/atmos/atmos_intro.htm The Atmosphere] From the website of the [[National Oceanic and Atmospheric Administration]] (NOAA) and the [[National Weather Service]] (NWS), Last updated May 5, 2009</ref> | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Revision as of 18:52, 30 December 2020
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Argon is a chemical element, typically found as a gas in its elemental form. It has the chemical symbol Ar, atomic number (number of protons) Z = 18, and a standard atomic weight of 39.948 g•mol −1.
Argon is a monatomic noble gas. 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 for dry air (0% humidity).[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