By Peter 8th grade Mill Valley Middle School  "Argon is a protective gas, so many uses for any task."		th Lord Rayleigh is one of the founders of argon.
Argon is used for welding	•Uses •Hazards •History •Properties •Misellaneous •Glossary •General Information •Bibliography	Mars has argon in its atmosphere.
Properties #1) Melting point: -189.3ºC   #2) Boiling point: -186.0ºC #3) Number of protons/ electrons: 18 #4) Number of neutrons: 22 #5) Classification: noble gas #6) Crystal structure: cubic #7) Density at 293ºK(room temp): 1.748 g/cm3 #8) Argon is a neutral gaseous atom #9) argon is an inert gas #10)Argon's radii is 372 pm. (picometer) or (372x10-12 meters)	General Information Name: Argon Symbol: Ar Atomic number: 18 Atomic mass: 39.948 amu Description: A colorless, odorless gas	Uses Argon is used for many things; #1) It's used as a protective gas/ atmosphere for growing of other substances. #2) Argon is also used to protect elements etc. from reacting with one another when producing titanium or other extremely reactive elements or substances. #3) It's also used as an inert gas shield for welding and cutting. #4) Under a protective atmosphere it can be used for the producing of many things, but mainly for the producing and growing of; silicon, germanium crystals, lasers, light bulbs, electric light bulbs, flouresent tubes, photo tubes, glow tubes, and for many other things.
History Argon was discovered by Lord Rayeigh and Sir William Ramsay in 1894. It was isolated by examination of residue from removing; nitrogen, oxygen, carbon dioxide, and water from clean air. The end result was argon gas. Hazards Asphyxia is pretty much the only hazard of argon. This is when argon takes place of the air you're breathing causing suffocation. other than that, argon is not harmful.		Miscellaneous •Argon is in the atmosphere and is a byproduct of liquefaction and separation of air. •Argon is a good atmosphere for working with air sensitive materials, since it's heavier than air but, less reactive than N2 (two atoms of nitrogen). •The air on earth contains less than 1% argon. •The atmosphere on Mars contains less than 2% argon.
Glossary Noble gas- Any of the elements in Group O of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert. Also called inert gas. Asphyxia/ asphyxiant- A condition in which an extreme decrease in the concentration of oxygen in the body accompanied by an increase in the concentration of carbon dioxide leads to loss of consciousness or death. Asphyxia can be induced by choking, drowning, electric shock, injury, or the inhalation of toxic gases. Protective gas-a non-reactive gassed for working with reactive materials Inert gas-See noble gas. Radii-A line segment that joins the center of a sphere (atom) with any point on its surface. Picometer- a metric unit of length equal to one trillionth of a meter Liquefaction-1. The process of liquefying. 2.The state of being liquefied. Atom-A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.		This is Sir William Ramsay.
Bibliography Definitions Material Safety All About Argon Basic Facts Earth and Argon Chemical Elements Images; •www.crk.umn.edu/ academics/BMFG/ •www.spacekids.com/yourspace/ mars_FAC_000301.html •www.chem.ucl.ac.uk/history/ people/ramsay_w.html •www.msh-alpes.prd.fr/hesop/deparis/ Histoireconvection.htm •Flamingtext.com •http://www.animfactory.net/af_science_earth_page_aa.html
	Created March, 2002