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Argon is an inert gaseous element. It is the third most prevalent noble gas in the earthís atmosphere. It is
present to the extent of .94% by volume. Itís symbol is Ar. The name Argon came from the Greek word
"argos" meaning "inactive". Argon is colorless and odorless. It is in group 18 on the periodic table. Itís
atomic number is 18 and itís atomic weight is 39,948 U. Argon melts at -189.3 degrees Celsius and boils at
-185.86 degrees Celsius. Argon is the third lowest in weight of the Nobel gases. Naturally occurring Argon
is composed of three isotopes. It has a gas density of 1.7837 g/l at 0 degrees Celsius. Argon has an
ionization energy 363 kcal/mol of atoms.. Heat of vaporization for Argon is 6.447 kJ/mole. Heat of fusion
for Argon is 1.188 KJ/Mol. Specific heat is .52 J/GK. The oxide is unknown. Argon is a nonmetal. Argon
doesnít appear to form true compounds however it is known to form a hydrate. Some ions have been
detected spectroscopically. For years, chemists thou!
ght that Nobel gases would not form chemical combinations with other elements and compounds. They
thought this because Nobel gas has itís outer most shell are completely filled with electrons. However, this
is not true. When the pressure and temperature is increased, the elements can be forced to form bonds.
Some examples are Krypton, Xenon, and Radon. Compounds with Argon, Helium, Neon are not likely to
form because the electrons are closely bounded to their nuclei. Argonís presence in the air was first
suggested by Henry Cavendish in 1785. It, however, was first separated by Lord Raleigh and Sir William
Ramsay in 1894.
Sir William Ramsay was a British chemist. He is known best for his isolation of elem...
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