5 results found for: “monoatomic_gold”.

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Gold

Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally...

Last Update: 2021-09-08T01:44:38Z Word Count : 15050 Synonim Gold

Specific heat capacity

c_{V}} of N 2 (736 J⋅K−1⋅kg−1) is greater than that of an hypothetical monoatomic gas with the same molecular mass 28 (445 J⋅K−1⋅kg−1), by a factor of 5/3...

Last Update: 2021-08-09T00:39:22Z Word Count : 8083 Synonim Specific heat capacity

Enrico Fermi

1925, Fermi responded with a paper "On the quantization of the perfect monoatomic gas" (Sulla quantizzazione del gas perfetto monoatomico), in which he...

Last Update: 2021-08-21T23:25:04Z Word Count : 10036 Synonim Enrico Fermi

Boron nitride nanosheet

with a band gap of ~5.9 eV, and therefore appear white in color. Uniform monoatomic BN nanosheets can be deposited by catalytic decomposition of borazine...

Last Update: 2021-06-30T18:39:48Z Word Count : 2340 Synonim Boron nitride nanosheet

Thermodynamic temperature

more heat energy for any given amount of temperature rise than do the monoatomic gases. Heat energy is born in all available degrees of freedom; this is...

Last Update: 2021-09-18T23:25:27Z Word Count : 12600 Synonim Thermodynamic temperature

Main result

Gold

Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally. In a pure form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum), naturally alloyed with other metals like copper and palladium and also as mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), which forms a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid, which dissolves silver and base metals, a property that has long been used to refine gold and to confirm the presence of gold in metallic substances, giving rise to the term acid test. Gold also dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold 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, gold is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history. In the past, a gold standard was often implemented as a monetary policy, but gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard was abandoned for a fiat currency system after 1971. A total of 197,576 tonnes of gold exists above ground, as of 2019. This is equal to a cube with each side measuring roughly 21.7 meters (71 ft). The world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, colored-glass production, gold leafing, and tooth restoration. Certain gold salts are still used as anti-inflammatories in medicine. As of 2017, the world's largest gold producer by far was China with 440 tonnes per year.


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