Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust. Argon may be used as the carrier gas in gas chromatography and in electrospray ionization mass spectrometry; it is the gas of choice for the plasma used in ICP spectroscopy. Because of this, it is used in potassium–argon dating to determine the age of rocks. Other noble gases would be equally suitable for most of these applications, but argon is by far the cheapest. Cryosurgery procedures such as cryoablation use liquid argon to destroy tissue such as cancer cells. Density: MP increases as we go down each column. The temperature at which vaporization (boiling) starts to occur for a given pressure is called the saturation temperature or boiling point. This chemical property of this first noble gas to be discovered impressed the namers. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. A 1994 incident, in which a man was asphyxiated after entering an argon-filled section of oil pipe under construction in Alaska, highlights the dangers of argon tank leakage in confined spaces and emphasizes the need for proper use, storage and handling. Argon is sometimes used as the propellant in aerosol cans. 1 ° C), A r (− 1 8 5. The gas is stored at high pressure. (+)-(S)-ar-turmerone is a sesquiterpenoid that is 2-methylhept-2-en-4-one substituted by a 4-methylphenyl group at position 6. The first argon compound with tungsten pentacarbonyl, W(CO)5Ar, was isolated in 1975. a) first gas, then liquid, last solid. In the universe, argon-36 is by far the most common argon isotope, as it is the most easily produced by stellar nucleosynthesis in supernovas. Symbol: Ar Atomic Number: 18 Atomic Mass: 39.948 amu Melting Point:-189.3 °C (83.85 K, -308.74 °F) Boiling Point:-186.0 °C (87.15 K, -302.8 °F) Number of Protons/Electrons: 18 Number of Neutrons: 22 Classification: Noble Gas Crystal Structure: Cubic Density @ 293 K: 1.784 g/cm 3 Color: Colorless Gas Atomic Structure Since the boiling point of argon is very close to that of oxygen (a difference of only 5.3°F or 2.9°C) separating pure argon from oxygen (while also achieving high recovery of both products) requires many stages of distillation. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. 343–383. However it was not widely recognised at that time. For example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. 2-chlorobenzoic acid is a monochlorobenzoic acid having the chloro group at the 2-position. Experimental Boiling Point: -185.7 °C Sigma-Aldrich SIAL-00752. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). The procedure carries a risk of producing gas embolism and has resulted in the death of at least one patient. [38], Argon is sometimes used for extinguishing fires where valuable equipment may be damaged by water or foam.[39]. Theoretical calculation predicts several more argon compounds that should be stable[11] but have not yet been synthesized. Melting point /K Boiling point /K; sodium: Na: 11: 371: 1156: magnesium: Mg: 12: 922: 1380: aluminium: Al: 13: 933: 2740: silicon: Si: 14: 1683: 2628: phosphorus: P: 15: 317: 553: sulfur: S: 16: 392: 718: chlorine: Cl: 17: 172: 238: argon: Ar: 18: 84: 87 When considered as the temperature of the reverse change from vapor to liquid, it is referred to as the condensation point. Alpha-Process nuclide 36Ar point 87.30 K, -185.85 °C, -302.53 °F to burglar who broke into his.. 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