Definition of physical and chemical properties of gold :
Gold is a metallic chemical symbol (Au),
one of the elements known since antiquity. It was possession of gold,
turquoise, yellow, bright and attractive sign of wealth for thousands
of years.
A shiny yellow metal in the form of blocks
can reflect the light seems Cefaiha tortillas green or blue. The gold
section Tkotaia accurate - is characterized by painted metal - while
there are other types of gold ranging in color from ruby and purple.
The gold in the transition team No. 1
the periodic table of chemical elements, and atomic number (79), and
mass Agency (196.967), and melt gold at a temperature of (1064) degrees
Celsius, and boils at (2856) degrees Celsius, and gold a good conductor
of heat and electricity.
The pure gold of the most viable types
of metal for roads and clouds, where you can hit him or his ways, even
up to the intensity (0.000013) cm. Can also form a golden wire length
(100) km from the amount of $ (29) grams. Gold and one of the most
metal soft bodied, with a hardness of (2.5) to (3) on a scale of hardness.
And gold of a very noble metal is not affected
by air or heat or humidity. And dissolves in concentrated
mineral acids known, such as hydrochloric acid,
and sulfuric,
phosphoric, and nitric acid but dissolves in
aqua regia a mixture of
hydrochloric and nitric acid centers.
(EDITORIAL USE ONLY) In this handout image provided by UNHCR, UNHCR
Special Envoy Angelina Jolie meets with refugees on the Jordanian border
minutes after they crossed from Syria on September 10, 2012 in Amman,
Jordan. With shelling clearly audible and visible across the border in
Syria, some 200 refugees made the dangerous crossing under cover of
night. Authorities estimate hundreds of families are fleeing the
violence and seeking safety across the border every night. (Photo by J
Tanner/UNHCR via Getty Images) Not for commerical use. Editorial use
only. No Book Sales. Mandatory credit/byline. Not for sale for marketing
or advertising campaigns. Image to be distributed exactly as supplied.
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