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Argon Element in Periodic Table | Atomic Number Atomic Mass
Argon is a chemical element with atomic number 18. It is an inert gas. It is included in the 18th Group of periodic table. Ar has a stable electronic configuration and is least chemically reactive. Hence it is also called a noble gas like all other elements in the same group. It is represented by the symbol Ar. Ar is colourless, odourless, tasteless and non-toxic gas under normal conditions of temperature and pressure. There are seven isotopes of Ar with mass numbers starting from 36 to 42. Out of them, the three isotopes 40Ar, 36Ar and 38Ar are naturally occurring in the order of abundance. The isotope 40Ar is present predominantly in the atmosphere of Mars, Jupiter and the biggest natural satellite of Saturn, called Titan.
Argon has completely filled octets in its electronic configuration, making it chemically unresponsive in formation of bonds with other elements. However, under extreme laboratory conditions, Argon was found to have reacted with hydrogen fluoride in presence of caesium iodide to form argon fluoro hydride, HArF, which is stable upto 17 kelvins ( -256 °C).
As the amount of occurrence of Argon gas is extremely less for industrial applications, it is manufactured commercially by fractional distillation of liquid air in a cryogenic air separation unit.
Uses Of Argon Element:
Argon is used in gas welding and cutting. Argon gas is used in electric light bulbs, fluorescent tubes, photo tubes and glow tubes at pressures at about 3 mm. Argon is also used as a blanket for production of titanium and other reactive elements. An Argon atmosphere is used for growing crystals of silicon and germanium.
Argon Element Information:
Discovery year: 1894
Discovered by:Lord Rayleigh and William Ramsay
Atomic number: 18
Relative atomic mass: 39.948
Electron configuration: [Ne] 3s2 3p6
Other elements in the same block:
Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton, Indium, Tin, Antimony, Tellurium, Iodine, Xenon, Thallium, Lead, Bismuth, Polonium, Astatine, Radon, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson are the same block elements.
Period: period 3
Other elements in the same period:
Group: group 18 (noble gases)
Other elements in the same group:
Other elements in the same orbital:
Key isotopes: 40Ar
Melting point: −189.34°C, −308.81°F, 83.81 K
Boiling point: −185.848°C, −302.526°F, 87.302 K
Element category: noble gas
Density (g cm−3): 0.001633
CAS number: 7440-37-1
Color: colorless gas
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