Value of gold

1. The physical properties of gold
Great density of gold, second only to platinum, for 19.32 / cubic centimeter, the diameter of 46 millimeters of golden mass of 1000 grams.
Gold is very soft, it is easy to wear, and is likely to become a very fine powder.
Kim has a good performance of the extension pressure, easy to forge and extended. 1 gram of gold can pull the growth of 3500 meters, a diameter of 0.0043 millimeters of gold. 1000 grams of gold can extend 530 square meters.
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Kim is hot and good conductor of electricity.
Gold is anti-magnetic, but the gold manganese magnetic susceptibility is relatively high. Containing many iron, nickel, cobalt gold are strong magnets.
Kim Jae-visible spectrum of the middle part of the region rapidly improve, reflecting the properties are in the infrared region. Gold with a high reflectivity, low rates of performance.
Gold contained in other elements of the alloy to change the wavelength, that is to change the color.
Gold has a low recrystallization temperature characteristics.
2. Kim's nuclear nature
Kim has 22 radioisotope. Only the atomic weight of this gold for the 197 isotope is stable.
At low-energy cases, the capture gamma-ray released by the electron is a natural gold most important nuclear reaction. As the son of one of the energy release of 5 electron volts, the capture cross-section large unusual, even to reach the target 20000. Gold nuclei with larger neutron capture cross-section. Kim has the ability to absorb X-rays.
3. The chemical properties of gold
Extremely high chemical stability of gold, at a variety of alkali and acid are very stable. Not be in the air oxidation, or discoloration. Gold has excellent anti-tarnish and anti-chemical corrosion.
Kim hydrogen, oxygen, nitrogen clearly show that insoluble. Oxygen does not affect its high-temperature characteristics, which are gold metallic with all the other most notable difference.
Gold can be dissolved in water at King, but also dissolved in hydrochloric acid and chromic acid mixture, also can be dissolved in sulfuric acid and high acid mixture in manganese, as well as cyanide salts can be dissolved in the solution.
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Gold compounds easily reduced to metal. Hydrogen under high temperature and potential sequence at the metals and gold before the hydrogen peroxide, two chloride, ferric sulfate, manganese dioxide as reducing agent, such as can be. Enables the ability to restore the strongest metals are magnesium, zinc, iron and aluminum. A variety of organic matter also can be used to restore the gold, such as formic acid, oxalic acid, acetylene, etc..