“gold”的概念、定义、翻译、参考文献-科学参考

gold

Chemistry

A soft yellow malleable metallic transition element; a.n. 79; r.a.m. 196.967; r.d. 19.32; m.p. 1064.43°C; b.p. 2807±2°C. Gold has a face-centred-cubic crystal structure. It is found as the free metal in gravel or in quartz veins, and is also present in some lead and copper sulphide ores. It also occurs combined with silver in the telluride sylvanite, (Ag,Au)Te₂. It is used in jewellery, dentistry, and electronic devices. Chemically, it is unreactive, being unaffected by oxygen. It reacts with chlorine at 200°C to form gold(III) chloride. It forms a number of complexes with gold in the +1 and +3 oxidation states. It is thought that the characteristic colour of gold is due to overlapping energy bands and associated relativistic effects (see relativistic quantum mechanics).
https://www.webelements.com/gold/ Information from the WebElements site

Geology and Earth Sciences

Malleable metallic element, Au; sp. gr. 19; hardness 2.5; bright yellow, but yellowish-white if silver is also present; occurs native as grains, threads, wire, sponge, and in many other forms, and may be combined with a variety of other metals including silver, copper, palladium, rhodium, or bismuth; occurs in placer deposits, in residual soils, and in veins associated with a variety of igneous and sedimentary rocks.

Economics

A precious metal, widely used both as a form of money and for jewellery and other ornamental purposes. Gold was already used in these other ways before its use as money and the invention of coinage. Gold coinage was at one time in general circulation, but the monetary use of gold is now confined to holdings of gold bullion by central banks as part of their foreign exchange reserves. Gold is still widely used as a store of value by individuals who mistrust government-created money because it is vulnerable to inflation. Gold costs real resources to mine, so that its value is not liable to be destroyed by inflation, unlike fiat money. See also gold standard.

单词	gold
释义	gold Chemistry A soft yellow malleable metallic transition element; a.n. 79; r.a.m. 196.967; r.d. 19.32; m.p. 1064.43°C; b.p. 2807±2°C. Gold has a face-centred-cubic crystal structure. It is found as the free metal in gravel or in quartz veins, and is also present in some lead and copper sulphide ores. It also occurs combined with silver in the telluride sylvanite, (Ag,Au)Te₂. It is used in jewellery, dentistry, and electronic devices. Chemically, it is unreactive, being unaffected by oxygen. It reacts with chlorine at 200°C to form gold(III) chloride. It forms a number of complexes with gold in the +1 and +3 oxidation states. It is thought that the characteristic colour of gold is due to overlapping energy bands and associated relativistic effects (see relativistic quantum mechanics). https://www.webelements.com/gold/ Information from the WebElements site Geology and Earth Sciences Malleable metallic element, Au; sp. gr. 19; hardness 2.5; bright yellow, but yellowish-white if silver is also present; occurs native as grains, threads, wire, sponge, and in many other forms, and may be combined with a variety of other metals including silver, copper, palladium, rhodium, or bismuth; occurs in placer deposits, in residual soils, and in veins associated with a variety of igneous and sedimentary rocks. Economics A precious metal, widely used both as a form of money and for jewellery and other ornamental purposes. Gold was already used in these other ways before its use as money and the invention of coinage. Gold coinage was at one time in general circulation, but the monetary use of gold is now confined to holdings of gold bullion by central banks as part of their foreign exchange reserves. Gold is still widely used as a store of value by individuals who mistrust government-created money because it is vulnerable to inflation. Gold costs real resources to mine, so that its value is not liable to be destroyed by inflation, unlike fiat money. See also gold standard.
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