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Argon is produced industrially by the fractional distillation of liquid air in a cryogenic air separation unit; a process that separates liquid nitrogen, which boils at 77.3 K, from argon, which boils at 87.3 K, and liquid oxygen, which boils at 90.2 K.
About 700,000 tonnes of argon are produced worldwide every year.
The complete octet (eight electrons) in the outer atomic shell makes argon stable and resistant to bonding with other elements.
Its triple point temperature of 83.8058 K is a defining fixed point in the International Temperature Scale of 1990.
The inner platinum ends (DD) of the wire receive a current from a battery of five Grove cells and a Ruhmkorff coil of medium size.
was suspected to be a component of air by Henry Cavendish in 1785.
In the universe, argon-36 is by far the most common argon isotope, being the preferred argon isotope produced by stellar nucleosynthesis in supernovas.
The name "argon" is derived from the Greek word meaning "lazy" or "inactive", as a reference to the fact that the element undergoes almost no chemical reactions.
Argon fluorohydride (HAr F), a compound of argon with fluorine and hydrogen that is stable below 17 K (−256.1 °C; −429.1 °F), has been demonstrated.
This discovery caused the recognition that argon could form weakly bound compounds, even though it was not the first.
Argon-36, in the form of argon hydride (argonium) ions, has been detected in interstellar medium associated with the Crab Nebula supernova; this was the first noble-gas molecule detected in outer space.
Argon is produced industrially by the fractional distillation of liquid air.
Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Argon is chemically inert under most conditions and forms no confirmed stable compounds at room temperature.Argon's complete octet of electrons indicates full s and p subshells.