The sheet will be only 0.00025 centimeters (one ten-thousandth of an inch) thick. Its melting point is 1,064.76°C (1,948.57°F) and its boiling point is about 2,700°C (4,900°F). Two other important properties are its reflectivity and lack of electrical resistance. But an electric current passes through gold very easily. It does not combine with oxygen or dissolve in most acids.
Gold foil of this thickness is often used to make the lettering on window signs. It does not react with halogens, such as chlorine or bromine , very easily.
Some people believe as much as 70 million tons of gold are dissolved in seawater.
They also think there may be another 10 billion tons on the bottom of the oceans.
For example, the mineral calavarite is mostly gold telluride (Au Te ).
At one time, gold was found in chunks or nuggets large enough to see.
A passage in Exodus, for example, refers to the clothing worn by Aaron: "And they did beat the gold into thin plates, and cut it into wires, to work it in the blue, and in the purple, and in the scarlet, and in the fine linen, with cunning work." Writings from every stage of human history tell of the discovery and use of gold.
Gold is one of the few elements that can affect politics and economics. Cities and towns have sprung up and died out as gold was discovered and then mined out.The Romans found it lying in stream beds in the Tagus River in Spain, the Po River in Italy, the Hebrus River in Thracia (now Greece), the Pactolus River in Asia Minor (now Turkey), and the Ganges River in India.O ne of the most famous items using gold is the Olympic gold medal. The last time a solid gold medal was used in the Olympics was 1912. During a visit to Haiti, Christopher Columbus (1451-1506) found gold nuggets lying on the bottom of rivers and harbors.These chemical properties also account for some important uses of gold. The most common compounds of gold are the tellurides.Gold coins, for example, do not corrode (rust) or tarnish very easily. Gold occurs in nature in both its native state and in compounds. A telluride is a compound of the element tellurium and one or more other elements.Gold has been called the most beautiful of all chemical elements.