371.10 yuan/g 2021-12-17 China's gold base gold price 367.00 yuan/g 2021-12-16 China's gold base gold price 367.40 yuan/g 2021-12-15 China's gold base gold price.
1. Gold is the elemental form of the chemical element gold (Au). It is a soft, golden yellow, corrosion-resistant precious metal. Gold is one of the rarest, most precious and highly valued metals. Internationally, gold is generally measured in ounces. In ancient China, "liang" was used as the unit of gold. It is a very important metal. It is not only a special currency used for reserves and investments, but also an important material in the jewelry industry, electronics industry, modern communications, aerospace and aviation industries and other sectors. The chemical symbol of gold is Au, and its financial English code is XAU or GOLD. The name Au comes from a story about Aurora, the goddess of dawn in Roman mythology, which means shining dawn.
2. The color of gold is golden yellow with metallic luster and is difficult to decompose. Density 19.3g/cm3, melting point 1064.4℃; has good ductility, can be pressed into thin foil, has extremely high heat transfer and electrical conductivity, and the resistance of pure gold is 2.4P. Pure gold has good resistance to chemical corrosion and is the best electroplating material.
3. As a precious metal, gold has good physical properties. "Real gold is not afraid of fire" means that gold has high chemical stability and is not prone to chemical reactions with other substances. There is no need to worry about oxidation. Discoloration. Even in the molten state, it will not oxidize and change color, and it will still sparkle after cooling. High density and heavy feel. Good toughness and ductility, good conductivity. Pure gold has a bright yellow color, but the color changes greatly after being mixed with other metals. For example, gold-copper alloys appear dark red, and silver-containing alloys appear light yellow or off-white. Gold is easily ground into powder, which is why gold is dispersed in nature. Pure gold jewelry is also easily worn and reduced in weight.
4. The atomic number of gold in Mendeleev’s periodic table is 79, that is, the nucleus of gold contains 79 protons, and the protons have a positive charge. At the same time, because it complies with the half-full rule, gold has good chemical stability. In the metal market, gold, together with ruthenium, rhodium, palladium, osmium, iridium, platinum and other metals, are collectively called precious metals. Although gold is a very soft metal, it is not as soft as lead and tin. Traces can be scratched on pure gold with a fingernail. This softness makes gold very easy to work. However, this is not ideal for manufacturers of ornaments, because it can easily scratch the ornaments and make them scratched. It loses its luster and affects its appearance. Therefore, when making jewelry with gold, copper and silver are generally added to increase its hardness. Gold is easy to forge and ductile, and can be rolled into transparent and green gold foil with a thickness of 0.001 mm. 0.5 grams of gold can be drawn into 160 meters of gold wire.