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Argon • Noble Gases

Primary XPS region: Ar2p
Overlapping regions: N/A
Binding energies of common chemical states:

Chemical state Binding energy Ar2p
Implanted Ar ~243 eV

Experimental Information

Interpretation of XPS Spectra

crystal structureAbout This Element

Symbol: Ar
Date of Discovery: 1894
Name Origin: Greek argos
Appearance: colorless gas
Discoverer: Ramsay, Rayleigh
Obtained From: air

Melting Point: 83.8 K
Boiling Point: 87.3 K
Density[kg/m3]: 1.784
Molar Volume: 22.56 × 10-6 m3/mol
Protons/Electrons: 18
Neutrons: 22
Shell Structure: 2,8,8
Electron Configuration: [Ne]3s23p6
Oxidation State: 0
Crystal Structure: Cubic Face Centered

Argon was discovered in 1894 by Lord Rayleigh and Sir William Ramsay, although Henry Cavendish suspected its existence over one hundred years earlier. This noble gas is chemically inert, and is colorless and odorless in its liquid and gaseous forms. Argon makes up slightly less than 1% of the Earth’s atmosphere. There are no known stable chemical compounds containing argon. Due to its inert nature, argon is used in lighting, as a blanket in the manufacture of titanium, and in other applications needing a nonreactive medium.


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