[Au] or gold is
probably my absolute favorite element, but not for its warm and metallic appearance,
but instead its unique ability to not only influence history but also build a
foundation for modern day chemistry. Gold whose symbol, [Au], can be a tad
confusing when related to the modern day name can be traced back to ancient times;
in fact its very symbol comes from the Anglo-Saxon name for gold which was ‘aurum’
which was taken from the Latin word ‘aurum’ meaning shining dawn. However due
to the age of the discovery of gold, it,s unclear who actually discovered the
element first, but it is indeed highly likely that Egypt discovered it, for
around the years of 3600 BC the Egyptians began using clay blowpipes to smelt
gold. Egyptians became very experienced
at metalworking, even beginning to distinguish qualities of gold, calling them
things like fine gold, white gold, green gold and ketem gold and several more
names. However they soon discovered that gold could not be improved as they
lacked the proper refining technology which wouldn’t come until the very end of
the millennium. The ability to refine gold was partly held back due to the
inability to create heat high enough to melt the element, for gold has to reach
the high heat of 1337.58°K [1064.43°C]. Today the refinery of gold is an almost
essential step in the smelting of gold. Goldsmiths start by heating gold at
extreme heat until it liquefies, then they add borax and soda ash into the vat,
this causes the gold to break bonds with other less precious metals, for those
metals then bond to the soda ash and borax leaving behind a more purified gold.
Gold was not
only used for aesthetics and showing rank like the Egyptians had used it for, in
Italy around the years of 700 BC an ancient civilization named the Etruscans
began using this metal for dentistry. The Etruscans had begun to use gold wire
to secure and wrap in replacement teeth which would most likely have been made
from wood, or ivory. However even though this started and was intended as just
a medical improvement, Etruscans began making gold bridges and even would
remove teeth to display solid gold prosthetic ones to show off their wealth.
But why is it today that dentists still use gold in many dental procedures? Why
not use another, less costly metal? Well the answer to this lies in the very properties of gold. Firstly, gold is a
highly durable metal, when it forms alloys it actually becomes stronger,
because of this gold is long lasting, the durability level of gold in an environment
such as a mouth has actually proven to be the same of a natural human tooth.
Stability is also highly important because metal in that environment has a
chance of eroding and being toxic, however gold is an extremely stable metal
and it doesn’t react when objects are
placed into the mouth, this also raises the idea of safety, gold has a very low chance of causing any
allergic reactions. Metallic gold not only is resistant to most metals but it
also has no taste or odor making it a good choice for the oral environment. Lastly,
as I had stated before gold has the ability to reflect and mimic a natural
tooth well, teeth have a flexibility that allows them to be hard but not wear
away without difficulty. Gold too has this property, it is not an extremely
hard metal, but it is durable and functions like a tooth even after several
years.
Surprisingly with
its stability gold is in fact a relatively soft metal, it got the small score
of 3 when tested with the Moh’s scale of
Hardness. In the case of this test, hardness refers to the resistance of a
material to being scratched or dented. The test is usually done by having a
pointed sharp piece of a specimen which then attempts to scratch the other specimen.
Gold despite simply being malleable is
also very ductile, meaning that if you beat one ounce of gold into a one μm
thick strand of wire it could reach lengths of 2000 kilometers. Gold is also
unique in a few other ways including the fact it is one of the few elements
able to be found in its natural state, gold is also an extremely good conductor
of electricity, like most metals. Around the autumn of 1803 Englishmen
Johnathan Dalton produced a study that claimed that matter was composed of atoms
and that all samples of a given compound would in fact have the same
combination of atoms. Dalton’s theory of atoms was later published by Thomas
Thomson in the third edition of System of
Chemistry circa 1807. This is important because he was the first to place an
alphabetical symbol onto gold in this book, though it was changed later to Au
Dalton gave gold the symbol of a capital G in closed within a circle.
However gold has a much deeper root in
chemistry than the average person would suspect. Alchemy, the pursuit of the philosophers
stone, or the ‘Elixir of Life’ which had the virtue of being able to cure any
disease, and provide longevity far past the barriers of mortality, but
alchemists passionately pursued something else as well, the formation of a
powder that would have the ability to transmute any metal into gold. But
changing an element requires you to change its atomic number, thus manipulating
its protons and electrons, and the number of protons cannot be altered by any
chemical means discovered by today’s chemists. However, physicists may have the
key, for centuries the transmutation of lead into gold has been unattainable,
for hundreds of years alchemists strived for this goal, eventually creating
what we now know as chemistry. However in 1951 Glenn Seaborg a Nobel Laureate
succeeded in transmuting a very small quantity of lead into gold, today,
particle accelerators constantly transmute elements, it works by charging particles
and accelerating them using a magnetic field. As I stated previously alchemy is
the root of chemistry, to see this translation and the transition that alchemy
went through, let us take a look into Robert Boyle, who is often named as being
the ‘Father of Chemistry’. Robert Boyle pushed the idea of concise measurements
and the use of empirical observations, and he was able to develop an essential piece
of the Ideal Gas Law. His influence from alchemy is clearly visible when
looking at his Corpuscular Theory which stated that matter was comprised of
corpuscles or tiny particles. There is a high level of speculation that this
word he chose ‘corpuscles’ came from the alchemists use of Corpuscularian tradition which is rooted back to a medieval
author named Gerber. Anyways, the point I am making by using this one specific
example is that if not directly alchemy still heavily influenced the foundry of
chemistry not to mention the use of some alchemists tools in chemistry that
were used into the late 1930s. There is actually an entire chapter on the
topics of alchemy and its uses in ‘modern’ chemistry in my copy of General Chemistry for Colleges, which was
written by Herman T. Briscoe, copyright 1935.
Those
are just a few reasons why gold is my favorite element, its versatility, impact
in not only the formation of a branch of science but in history and medical
practice as well as its beauty. It certainly has an allure to me, just as a final thought let us reflect upon a
quote by Russian novelist Leo Tolstoy, “Truth,
like gold, is to be obtained not by its growth, but by washing away from it all
that is not gold.”
Work
Cited:
"Metals:
Sources, Technologies, Uses." Reshafim. Published: October 2003. Accessed: December 5, 2014. URL:
www.reshafim.org.il/ad/egypt/trades/metals.htm
"Why Dentists
use Gold." Sell Gold HQ. , Division of Veritas Consumer
Information Network, Published: 2005. Accessed: December 5, 2014. URL: http://www.sellgoldhq.com/why-dentists-use-gold-use/
Briscoe, Herman. General
Chemistry for Colleges. Cambridge Massachusets: The Riverside Press, 1935.
Print.
Coyne, Glynis.
"Lead to Gold, Sorcery to Science: Alchemy and the Foundations of Modern
Chemistry." The People, Ideas and Things Journal. PIT Journal, Published:
2012. Accessed: December 5, 2014. URL: http://pitjournal.unc.edu/article/lead-gold-sorcery-science-alchemy-and-foundations-modern-chemistry
Harris, William.
"How Gold Works." How Stuff Works . InfoSpace LLC, Published:
1998. Accessed: December
5, 2014. URL: http://science.howstuffworks.com/gold5.htm
Helmenstine, Anne
Ph.D. "Gold Facts." About Education . About.com, Published: 2014.
Accessed: December
5, 2014. URL: http://chemistry.about.com/od/elementfacts/a/gold.htm
Helmenstine, Anne
Ph.D. "Turning Lead into Gold." About Education . About.com,
Published: 2014. Accessed: December 5, 2014. URL:http://chemistry.about.com/cs/generalchemistry/a/aa050601a.htm
Winter, Mark.
"Gold: The Essentials." Web Elements. The University of Sheffield
& WebElements Ltd. UK, Published: 1993. Accessed: December 5, 2014. URL: www.webelements.com/gold/
-T.H. [I hope you enjoy this paper, it was originally for my Chem Professor but I haven't been active as of late so, I thought that this would qualm your eager minds, if anyone actually reads my blog.]