1-9 pages(Other pages are just infoblocs) Gold as element. in periodictable. It's name and symbol. Physical and other properties. Chemical proporties. Application. End (9th page) //Other pages include additional information that was not included in slide.

1. GoldPrepared by Tolegen D.

3. The name is
The symbol comes
from the latin
‘aurum’, from the
latin meaning
'shining dawn'.

10. Because gold is visually pleasing and workable and does not tarnish or
corrode, it was one of the first metals to attract human attention.
Examples of elaborate gold workmanship, many in nearly perfect
condition, survive from ancient Egyptian, Minoan, Assyrian,
and Etruscan artisans, and gold continues to be a highly favoured
material out of which to craft jewelry and other decorative objects.
(see metalwork; goldwork.)

11. Alloys
To increase its strength gold is usually alloyed with other metals, such as silver,
copper, platinum or palladium, to increase its strength.
The amount of gold in an alloy is measured with a unit called a karat. One karat is
equal to one part in twenty-four.

12. Gold Facts
1. Gold is the only metal that is yellow or "golden." Other metals may develop a yellowish color, but only after they
have oxidized or reacted with other chemicals.
2. Nearly all the gold on Earth came from meteorites that bombarded the planet over 200 million years after it
formed.
3. The element symbol for gold—Au—comes from the old Latin name for gold, aurum, which means "shining dawn"
or "glow of sunrise." The word gold comes from the Germanic languages, originating from the Proto-Germanic
gulþ and Proto-Indo-European ghel, meaning "yellow/green." The pure element has been known since ancient
times.
4. Gold is extremely ductile. A single ounce of gold (about 28 grams) can be stretched into a gold thread 5 miles (8
kilometers) long. Gold threads can even be used in embroidery.
5. Malleability is a measure of how easily a material can be hammered into thin sheets. Gold is the most malleable
element. A single ounce of gold can be beaten into a 300-square-foot sheet. A sheet of gold can be made thin
enough to be transparent. Very thin sheets of gold may appear greenish blue because gold strongly reflects red and
yellow.
6. Although gold is a heavy, dense metal, it is generally considered nontoxic. Gold metal flakes may be eaten in foods
or drinks, although it is a common allergen for some.1
7. Pure elemental gold is 24 karats, while 18-karat gold is 75 percent pure gold, 14-karat gold is 58.5 percent pure
gold, and 10-karat gold is 41.7 percent pure gold. The remaining portion of the metal usually used in gold jewelry
and other items is silver, but items can also consist of other metals or a combination of metals, such as platinum,
copper, palladium, zinc, nickel, iron, and cadmium.
8. Gold is a noble metal. It is relatively unreactive and resists degradation by air, moisture, or acidic conditions.
While acids dissolve most metals, a special mixture of acids called aqua regia is used to dissolve gold.
9. Gold has many uses aside from its monetary and symbolic value. Among other applications, it is used in
electronics, electrical wiring, dentistry, medicine, radiation shielding, and in coloring glass.
10. High-purity metallic gold is odorless and tasteless. This makes sense since the metal is unreactive. Metal ions
confer flavor and odor to metallic elements and compounds.

13. Where Gold Is Found
Gold is found as the free metal and in tellurides. It is widely distributed and almost always
associated with pyrite or quartz. Gold is found in veins and in alluvial deposits. Gold occurs in
sea water in the amount of 0.1 to 2 mg/ton, depending on the location of the sample.
Transmuting lead into gold was one of the major gold of the alchemists. Modern nuclear
chemists have found methods to accomplish this historic task.

14. money
Because of its unique qualities, gold has been the one material that is
universally accepted in exchange for goods and services. In the form of coins
or bullion, gold has occasionally played a major role as a high-
denomination currency, although silver was generally the standard medium
of payments in the world’s trading systems. Gold began to serve as backing
for paper-currency systems when they became widespread in the 19th
century, and from the 1870s until World War I the gold standard was the
basis for the world’s currencies. Although gold’s official role in the
international monetary system had come to an end by the 1970s,
the metal remains a highly regarded reserve asset, and approximately 45
percent of all the world’s gold is held by governments and central banks for
this purpose. Gold is still accepted by all nations as a medium
of international payment.

15. From were
On Earth, gold finally reached us some 200 million years after the
formation of the planet when meteorites packed with gold and other
metals bombarded its surface. During the formation of Earth, molten
iron sank to its centre to make the core. This took with it the vast
majority of the planet’s precious metals — such as gold and platinum.
In fact, there are enough precious metals in the core to cover the
entire surface of Earth with a four-metre thick layer.

16. history
Gold has been known since prehistoric times and was one of the first metals
to be worked, mainly because it was to be found as nuggets or as particles in
the beds of streams. Such was the demand that by 2000 BC the Egyptians
began mining gold. The death mask of Tutankhamen, who died in 1323 BC,
contained 100 kg of the metal. The royal graves of ancient Ur (modern Iraq),
which flourished from 3800 to 2000 BC, also contained gold objects.
The minting of gold coins began around 640 BC in the Kingdom of Lydia
(situated in what is now modern Turkey) using electrum, a native alloy of
gold and silver. The first pure gold coins were minted in the reign of King
Croesus, who ruled from 561–547 BC.

17. abundance
An attractive and highly valued metal, gold has been known for at least 5500 years.
Gold is sometimes found free in nature but it is usually found in conjunction
with silver, quartz (SiO2), calcite (CaCO3), lead, tellurium, zinc or copper. There is
roughly 1 milligram of gold dissolved in every ton of seawater, although extracting
it currently costs more than the gold is worth. It has been estimated that all of the
gold that has currently been refined could be placed in a cube measuring 20 meters
on a side.
Veins enriched in gold form when the gold was carried up from great depths with
other minerals, in an aqueous solution, and later precipitated. The gold in rocks
usually occurs as invisible disseminated grains, more rarely as flakes large enough to
be seen, and even more rarely as masses or veinlets. Crystals about 2.5 cm (1 inch)
or more across have been found in California. Masses, some on the order of 90 kg
(200 pounds), have been reported from Australia.
Natural abundance
Gold is one of the few elements to occur in a natural state. It is found in veins and
alluvial deposits. About 1500 tonnes of gold are mined each year. About two-thirds
of this comes from South Africa and most of the rest from Russia.
Seawater contains about 4 grams of gold in 1,000,000 tonnes of water. Overall this is
a huge amount of gold stored in the oceans but, because the concentration is so low,
attempts to reclaim this gold have always failed.

18. Gold is, in fact, one of the first metals known to man with its origin
being dated back to 3400 BCE by the Egyptians. Gold has always been
a symbol of wealth and beauty. During Egypt's reign of Pharaoh's, the
Egyptians would often amass tremendous amounts of gold just to
cover the coffin of a deceased Pharaoh.
Interestingly enough, when King Tutankhamun, commonly referred
to as King Tut, died, his coffin contained approximately 112 kg of
gold. For those of you unfamiliar with the metric system, 112 kg is
about 247 lbs. To give a direct comparison, that is more gold per
pound than the size of an average NFL running back! Moreover, the
discovery of gold was the cause of a great migration of people to
California during the late 1800s during the California Gold Rush.

19. Gold (Au), chemical element metal of Group 11 (Ib),
Period 6, of the periodic table.
Along with silver and copper were the first three
elements known to man.
They were all used as primitive money well before
the first gold coins which appeared in Egypt around
3400 BC.
Gold has always been a symbol of wealth and beauty.