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General infromation and atomic structure
Argon Ar
18 39.948
18 protons and electrons
Ar-40 msot common isotope
22 neutrons in most common isotope

Physical properties
Gas at room tempiture
Melting Point: 83.80 K (-189.35°C or -308.83°F)
Boiling Point: 87.30 K (-185.85°C or -302.53°F)
Density: 0.0017837 grams per cubic centimeter
Estimated Crustal Abundance: 3.5 milligrams per kilogram
Background
Argon was discovered by Sir William Ramsay, a Scottish chemist, and Lord Rayleigh, an English chemist, in 1894. Argon makes up 0.93% of the earth's atmosphere, making it the third most abundant gas. Argon is obtained from the air as a byproduct of the production of oxygen and nitrogen.
Origin of name: the greek word for inactive agros
Chemical family: non-metal
Argon is frequently used when an inert atmosphere is needed. It is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament. Argon is also used to form inert atmospheres for arc welding, growing semiconductor crystals and processes that require shielding from other atmospheric gases.
Chemical properties
argon fluorohydride is the only compound (HArF)
not reactive
argon is used to fillincandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament. Argon is also used to form inert atmospheres for arc welding, growing semiconductor crystals and processes that require shielding from other atmospheric gases.





Work cited

http://education.jlab.org/itselemental/ele018.html