Argon: Difference between revisions

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Argon

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Noble gas:

Properties:

Colorless, odorless, inert gas. Non-toxic.

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 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.^[1]

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 '''Argon''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ar. Its [[atomic number]] (the number of [[proton]]s) is 18. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 39.948 g•mol<sup> −1</sup>, 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 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>
+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==
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