
- Discovered by Sir William Ramsay and Lord Rayleigh at 1894 in Scotland.
- Origin of name of argon from the Greek word "argos" meaning "inactive".
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William Ramsay
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Lord Rayleigh
Properties
Physical Properties:
- Phase: Gas
- Color: Colorless gas
- Melting point: -189⁰C
- Boiliing Point: -185,9⁰C
- Densitiy at vapour: 0.0017 g/cm³ at 21⁰C
Chemical Properties:
- Argon is stable compound
- Argon is more soluble in water than nitrogen
- Argon does not combine with titanium, boron, or uranium when heated in contact with these elements, or with fluorine at the ordinary temperature or under the influence of the electric spark.
- Argon has approximately the same solubility as oxygen
Occurrence
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Argon is contituting about 0,941% (with no carbon dioxide)
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Extraction
- Produced from liquid air by fractional distillation.
- Produced by heating nitrogen gas from the atmosphere with hot magnesium or calcium.
Compound
- Compounds of argon have been detected in inert gas matrix isolation, cold gases, and plasmas, and molecular ions containing argon have been made and also detected in space. One solid interstitial compound of argon, Ar1C60 is stable at room temperature
- Neutral argon atoms bind very weakly to other neutral atoms or molecules to form van der Waals molecules
Van der Waals
↓
AgAr, Ag2Ar, NaAr, KAr, MgAr, CaAr, SrAr, ZnAr, CdAr, HgAr, SiAr, InAr, CAr, GeAr, nAr, and BAr
Application
Light bulb
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Plasma Globe
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Welding
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Glowes tube
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Argon laser
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Ice coring
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Incandescent light bulb
- Incandescent light bulb is consists of a metal wire inside a clear glass bulb. An electric current passes through the wire, causing it to get very hot and give off light.
- Because argon is inert, it will not react with the hot wire, leaving the metal hot for very long periods of time.
- The light bulb will stop giving off light only when the metal breaks.
Interesting Fact
- Argon is created when the potassium in the earth's crust decays.
- It's the most abundant of rare gases.
- It emits light when electronically excited.
- About 1,6% of Mars' atmosphere contains argon
- Because noble gas atoms have a complete valence electron shell, they are not very reactive. Argon does not readily form compounds
References:
- http://www.lenntech.com/periodic/elements/ar.htm
- http://www.chemistryexplained.com/elements/A-C/Argon.html
- http://www.softschools.com/facts/periodic_table/argon_facts/197/
- https://www.hobart.k12.in.us/ksms/PeriodicTable/argon.htm
- www.livescience.com/29023-argon.html
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