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Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction. A relatively rare element, [9] [10] gold is a precious metal that has been used for coinage, jewelry, and other works of art throughout recorded history. In the past, a gold standard was often implemented as a ...
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5 days ago · gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table of the elements. Gold has several qualities that have made it exceptionally valuable throughout history. It is attractive in colour and brightness, durable to the point of virtual indestructibility, highly malleable, and usually ...
- The Editors of Encyclopaedia Britannica
Gold. 79. 196.967. Glossary. GroupA vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. PeriodA horizontal row in the periodic table. The atomic number of each element increases by one, reading from left to right.
May 18, 2024 · Gold sank to the Earth's core during the planet's formation. It's only accessible today because of asteroid bombardment. Theoretically, it's possible to form gold by the nuclear processes of fusion, fission, and radioactive decay. It's easiest for scientists to transmute gold by bombarding the heavier element mercury and producing gold via decay.
- Anne Marie Helmenstine, Ph.D.
- Gold Basics
- Gold Physical Data
- Properties
- Common Uses For Gold
- Where Gold Is Found
- Gold Trivia
- References
Atomic Number:79Symbol:AuAtomic Weight:196.9665Discovery:known since prehistoric timeDensity (g/cc):19.3Melting Point (°K):1337.58Boiling Point (°K):3080Appearance:soft, malleable, yellow metalIn mass, gold is a yellow-colored metal, although it may be black, ruby, or purple when finely divided. Gold is a good conductor of electricity and heat. It is not affected by exposure to air or to most reagents. It is inert and a good reflector of infrared radiation. Gold is usually alloyed to increase its strength. Pure gold is measured in troy w...
Gold is used in coinage and is the standard for many monetary systems. It is used for jewelry, dental work, plating, and reflectors. Chlorauric acid (HAuCl4) is used in photography for toning silver images. Disodium aurothiomalate, administered intramuscularly, is a treatment for arthritis.
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 occursin sea water in the amount of 0.1 to 2 mg/ton, depending on the location of the sample.
Gold is one of the few elements that can be found in its native state.Gold is the most malleable and ductile metal. One ounce of gold can be beaten out to 300 ft2or stretched into a wire 2000 kilometers long (1 μm thick).The melting point of gold is an assigned value, which serves as a calibration point for the International Temperature Scale and International Practical Temperature Scale.The gold ion in the +1 oxidation state (Au(I)+) is called the aurous ion.Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952) International Atomic Energy Agency ENSDF database (Oct 2010)
- Anne Marie Helmenstine, Ph.D.
5 days ago · Gold - Element, Precious Metal, Jewelry: Gold is one of the densest of all metals. It is a good conductor of heat and electricity. It is also soft and the most malleable and ductile of the elements; an ounce (31.1 grams; gold is weighed in troy ounces) can be beaten out to 187 square feet (about 17 square metres) in extremely thin sheets called gold leaf.
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gold, Metallic chemical element, one of the transition elements, chemical symbol Au, atomic number 79. It is a dense, lustrous, yellow, malleable precious metal, so durable that it is virtually indestructible, often found uncombined in nature. Jewelry and other decorative objects have been crafted from gold for thousands of years.
