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Gold



Name Gold
Atomic Number 79
Atomic Weight 196.96655
Symbol Au
Melting Point ( °C ) 1064.43 °C (1337.5801 K)
Boiling Point ( °C ) 2807.0 °C (3080.15 K)
Density (g/cm3) 19.3 g/cm3
Earth crust (%) 0.0011 ppm
Discovery (Year) circa 3000 B.C.
Group 11
Electron configuration [Xe] 4f14 5d10 6s1
Ionization energy (eV) 20.20


Gold Is an element on the periodic table, that was a major source of income during the gold rush. It can be described in karats, if gold has 24 karats it means that it is pure gold which gives it more value. This is a very malleable and ductile metal.<ref> Mark Winter. 2009. Gold: The Essentials. Retrieved Feb. 4, 2009. http://www.webelements.com/gold/</ref> The atomic number of gold is 79, <ref> Atomic Number. Noblemind. Retrieved Feb. 4, 2009. http://www.noblemind.com/search.exe?keyword=Gold+Atomic+Number&var=2 </ref> the atomic weight is 196.96655, <ref> NIST. Retrieved Feb. 4 , 2009. http://physics.nist.gov/PhysRefData/Handbook/Tables/goldtable1.htm </ref>. the density is 19.3 grams, <ref> Density of Gold and Other Metals. Retrieved Feb. 4, 2009. http://www.supermalta.com/en-us/pg_19.html </ref>. and the symbol is Au. <ref> 2005. The Element Gold. Periodic Table. Retrieved Feb. 4, 2009. http://www.periodic-table.org.uk/element-gold.htm </ref>


Discovery of Gold The first discovery of gold in California, was in 1848, by James W. Marshall. Gold had been discovered in places all over the world, for centuries before (approximately 3000 BC), but this is what started the gold rush, a very specific time in the U.S.

Melting point and Boiling point Gold’s melting point is 1064.43 degrees Celsius, <ref> Gold. Noble Mind. Retrieved Feb. 4, 2009. http://www.noblemind.com/search.exe?keyword=Gold+Melting+Point&var=2 </ref>. and its boiling point is 2807 degrees Celsius. <ref> Jeffrey C. 2008. Cha Cha. Retrieved Feb. 4, 2009. http://www.chacha.com/question/what-is-the-boiling-point-of-gold </ref>.


Gold in Karats

By describing how much gold an alloy has we describe it in karats. Having one karat is equal to having one out of twenty-four which means that twenty-three out of twenty-four would be any other substance. Another example would be having eighteen out of twenty-four which means only three-fourths would be gold, that’s why when its twenty-four karats its pure gold. If you have 24 karat gold, it is usually very thin and easily broken. <ref> Chris Woodford. 2008. Gold. Retrieved Feb. 4, 2009. http://www.explainthatstuff.com/gold.html</ref>. Usually if you have 24 karat gold, it's very thin and easily broken.


Measurements

Not only is gold described in karats it can also have a measurement called the fineness. Sometimes when you have twenty-four karats it can also be called “1000 fine” which also means that its pure gold. Having only three-fourths of gold would be described as “750 fine.”<ref> Chris Woodford. 2008. Gold. Retrieved Feb. 4, 2009. http://www.explainthatstuff.com/gold.html</ref>. when the gold is used in coins it would be considered as “900 fine.” Having a “900 fine” would be like having ninety percent gold and ten percent silver. In order to know if your gold is pure or not it usually has a stamp that is called a hallmark which lets you know how pure the gold actually is. <ref> Chris Woodford. 2008. Gold. Retrieved Feb. 4, 2009. http://www.explainthatstuff.com/gold.html</ref>.


Strong or Soft?

Gold is a very soft metal, if you want it to be stronger, you combine it, called alloyed. Gold's usually alloyed with silver, copper, platinum, etc. Gold is also a very good conductor of electricity. Gold is not affected by air, so it does not get ruined. <ref> Mark Winter. 2009. Gold: The Essentials. Retrieved Feb. 4, 2009.http://www.webelements.com/gold/ </ref> Gold is very easy to shape and is also easy to draw into wires. Sometimes gold can be as thin as a leaf and can be used for arts and craft. A sheet of gold can be 400 times thinner than a human hair. <ref> Steve Gagnon. The Element Gold. Retrieved Feb. 4, 2009. http://education.jlab.org/itselemental/ele079.html </ref>.


Is Gold Expensive?

Gold can be found at a jewelery store and its price tends to change day by day. Not only that but its one of the most tracked prices. Gold can also be measured by Troy weight. In the United States the value of gold was at twenty dollars and sixty-seven cents per troy ounce. During the year of 1934 the value was fixed to thirty five per troy ounce. During the year of 1968 there was a gold crisis. In the year of 1980 gold reached a price of six-hundred twenty pero troy ounce. Then as of January of 1990 the price of gold lowered to four-hundred ten dollars per troy ounce. <ref> University of California. 2003. Gold. Retrieved Feb. 4, 2009. http://periodic.lanl.gov/elements/79.html </ref>

References

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