โ–ธโ–ธ
  • ๐Ÿ‡ฌ๐Ÿ‡ง Argon
  • ๐Ÿ‡จ๐Ÿ‡ณ ๆฐฌ
  • ๐Ÿ‡ณ๐Ÿ‡ฑ Argon
  • ๐Ÿ‡ซ๐Ÿ‡ท Argon
  • ๐Ÿ‡ฉ๐Ÿ‡ช Argon
  • ๐Ÿ‡ฎ๐Ÿ‡ฑ ืืจื’ื•ืŸ
  • ๐Ÿ‡ฎ๐Ÿ‡น Argo
  • ๐Ÿ‡ฏ๐Ÿ‡ต ใ‚ขใƒซใ‚ดใƒณ
  • ๐Ÿ‡ต๐Ÿ‡น Argão
  • ๐Ÿ‡ท๐Ÿ‡บ ะั€ะณะพะฝ
  • ๐Ÿ‡ช๐Ÿ‡ธ Argón
  • ๐Ÿ‡ธ๐Ÿ‡ช Argon

Argon: the essentials

Argon atoms have 18 electrons and the shell structure is 2.8.8. The ground state electronic configuration of neutral argon is [Ne].3s2.3p6 and the term symbol of argon is 1S0.

Argon: description  

Argon is a colourless and odourless gas present to a very small extent in the atmosphere. Argon is very inert (indeed it is referred to as one of the noble gases) and is not known to form true chemical compounds. It makes a good atmosphere for working with air-sensitive materials since it is heavier than air and less reactive than N2. Today, the chemical symbol for argon is Ar but until 1957 its sybol was simply A.

argon
Image adapted with permission from Prof James Marshall's (U. North Texas, USA) Walking Tour of the elements CD.

Argon: physical properties

More physical properties...

Argon: heat properties

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Argon: atom sizes

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Argon: electronegativities

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Argon: orbital properties

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Argon: abundances

More geological data...

Argon: crystal structure

Ar crystal structure
The solid state structure of argon is: bcc (body-centred cubic).

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Argon: biological data

Argon has no biological role.

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Argon: uses

Uses...

Argon: reactions

Reactions of argon as the element with air, water, halogens, acids, and bases where known.

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Argon: binary compounds

Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of argon where known.

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Argon: compound properties

Bond strengths; lattice energies of argon halides, hydrides, oxides (where known); and reduction potentials where known.

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Argon: history

Argon was discovered by Sir William Ramsay, Lord Rayleigh in 1894 at UCL, London, England. Origin of name: from the Greek word "argos" meaning "inactive".

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Argon: isotopes

Isotope abundances of argon
Isotope abundances of argon with the most intense signal set to 100%.

Argon isotopes are used as precursors in the production of radioisotopes. Ar-40 and Ar-38 are used in the production of radioactive K-38 which can be used as a blood flow tracer. Ar-40 is used in the production of radioactive Ar-41 which is used to trace gas flows.

More isotope and NMR data...

Argon: isolation

Isolation: argon is present to a small extent in the atmosphere and is obtained as a byproduct from the liquefaction and separation of air. This would not normally be carried out in the laboratory and argon is available commercially in cylinders at high pressure.