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An element found on the periodic table under
atomic number: 79
symbol: Au
atomic weight/atomic mass: 196.96655g
group name: Coinage metal
group: 11
period: 6
block: d-block
CAS Registry ID: 7440-57-5
Standard state: solid at 298 K
Colour: gold
Classification: Metallic
Availability: gold is available in many forms including wire, foil, and bars.
Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold). It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side. It is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple.
It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength. It is a good conductor of heat and electricity, and is unaffected by air and most reagents.
The most common gold compounds are auric chloride (AuCl3) and chlorauric acid (HAuCl4). A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). It is unaffected by air and most reagents. It is found free in nature and associated with quartz, pyrite and other minerals. Two thirds of the world's supply comes from South Africa, and 2/3 of USA production is from South Dakota and Nevada. Gold is found in sea water, but no effective economic process has been designed (yet) to extract it from this source.
It would not normally be necessary to make gold in the laboratory as it is readily available commercially. The most romantic way to extract gold is by panning it out from a stream in some pleasant valley but most such sources are now depleted. Panning relies upon the density of gold (which is very high) being much greater than that of the sand and other particulates. It therefore settles to the bottom of the pan.
Today, more often than not, gold is extracted from ores. These ores often contain relatively little gold. Some of these processes cause environmental concern. The ore is crushed to a powder so as to expose the small gold particles. These are dissolved by treatment of the rock with cyanide solution in air. The result of this is a gold cyanide complex. Addition of zinc powder to the resulting solution precipitates out the gold.
4Au + 8NaCN + O2 + 2H2O 4NaAu(CN)2 + 4NaOH
2NaAu(CN)2 + Zn 2NaCN + Zn(CN)2 + Au (s)
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Gold: A fun, loving, outgoing person. Always cheerful and there for you when you need her the most. A Gold is a good friend that you will never want to lose. She's an amazing person inside and out. She's very competitive and kind but mean when not in a good mood. She's also very beautiful. She's usually called goldie, goldilocks or silver. To have and know a Gold is a treasure best kept. Also, she has some bomb ass pussy.
Boy 1: who is that?
Boy 2: oh that's Gold
Boy 1: damn she's bad asf yo
Boy 2: tuhh you ain't gotta say it twice bro
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To clench one's right fist and slam it down on one's left palm.
Performed when something funny or exciting is, has or is about to occur.
-That's Gold
-Footy Show
-Harragon
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The $300,000 Mr. T wears around his neck every day.
Don't touch my gold, foo'(s)!
Watch my gold for me, foo'!
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Gold teeth in someone's mouth. A gold grill.
"Dem boys from da south got golds in they mouth"
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Something that is classic like a practical joke you will laugh about in future
guy trips over and lands upside down in bush his mates go "shit man that shit was gold.
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