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Argon



Name Argon
Atomic Number 18
Atomic Weight 39.948(1)
Symbol Ar
Melting Point ( °C ) 83.81 K ​(−189.34 °C, ​−308.81 °F)
Boiling Point ( °C ) 87.302 K ​(−185.848 °C, ​−302.526 °F)
Density (g/cm3) 1.784 g/L(at 0 °C, 101.325 kPa)
Earth crust (%)
Discovery (Year) Lord Rayleigh and William Ramsay (1894)
Group group 18, noble gas, block p
Electron configuration [Ne] 3s2 3p6
Ionization energy (eV) 1st: 1520.6 kJ·mol−1

2nd: 2665.8 kJ·mol−1 3rd: 3931 kJ·mol−1 (more)

Argon was suspected by Henry Cavendish in 1785 but wasn't discovered until 1894 by Sir William Ramsay. <Ref> Bentor, Y. Argon. Retrieved January 21, 2009, from http://www.chemicalelements.com/elements/ar.html</ref> The element symbol for argon is Ar and the gas was produced by factorization of liquid air. <ref name="UC"> University of California.(2003). Argon. Retrieved January 21, 2009, from http://periodic.lanl.gov/elements/18.html</ref> The element argon has the same solubility as oxygen. When argon is in the form of a gas and liquid it's colorless and odorless. It is also known as a non reactive gas and it can't form a true chemical compound. <ref name="UC" /> This element is used in electric light bulbs,fluorescent lighting, filling photo tubes, and glow tubes. It is also used as a shield when it is an inert gas.

References

Unknown extension tag "references"

http://en.wikipedia.org/wiki/Argon


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