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Silver


Discovery

Silver was discovered by Captain John M. Bullard at Chloride Flats. Silver is mostly used for jewelry, but is also used for coins. The United States fixed the price of Silver in 1939. There was a change that was authorized in the metallic composition of the three U.S. subsidiary denominations to clad or type coins.This was called the Coinage Act of 1965. It was the first change in coinage since the monetary system was established in 1972. Silver is a little bit harder than gold, but has the highest electrical and thermal conductivity of all metals and possesses the lowest contact of resistance. Silver tarnishes when it is exposed to Ozone, Hydrogen Sulfide or air containing Sulfur. Silver is stable in pure water and air. Most of Silver's salts are poisonous, even though Silver is considered to be nontoxic. Compounds of Silver can be absorbed in the circulatory system. Reduced Silver is deposited in the various tissues of the body. Silver kills many lower organisms effectively without harm to higher animals and has germicidal effects.

Isotopes

There are two isotopes of Silver, Ag-107 and Ag-109. Ag-107 has been used for the (cyclotron) production of Pd-103. Ag-109 is used for the production of Ag-110m which is commonly used as a gamma reference source. Ag-109 is also used for the production of In-110 and Cd-109. Ag-107 is the most abundant isotope with 51.839% natural abundance.

Chemical Properties

Silver is one of the most inactive metals. It does not react with Oxygen normally, but slowly reacts to Sulfur compounds in the air. Silver does not react readily with water, acids, or any other compound, and does not burn unless it is silver powder.

Physical Properties

Silver is the second most malleable and ductile metal. It is a very soft, white metal and can be stretched out into different shapes. Silver also conducts heat and electricity better than any other element on the Periodic Table. Silver also reflects light very well.

References

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Silver - Wikipedia Chemistry Explained


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