The nature of gold

The nature of gold
Lev periodic table, atomic number 79 gold, gold nucleus surrounded by negatively charged 79 spin electronics. Kim in front of a neighbor is osmium, iridium, platinum, gold and ruthenium, rhodium, palladium, osmium, iridium, platinum and the metals have very good chemical stability, referred to as precious metals.


1. The physical properties of gold

Large density of gold, second only to platinum, to 19.32 / cubic centimeter, 46 mm diameter of the golden goal weight of 1,000 grams.

Gold is very soft, very easy to wear, can easily become a fine powder.

Kim has a good extension of pressure performance, easy to forge and extension. 1 gram of gold can pull 3500 meters growing diameter of 0.0043 mm of gold. 1,000 grams of gold can extend 530 square meters.

Gold is a good conductor of heat and electricity.

Gold is the anti-magnet, but the very high magnetic susceptibility of gold manganese. Containing large amounts of iron, nickel, cobalt, gold is a strong magnet.

Gold in the middle part of the visible spectrum region, the rapid increase in the infrared reflection performance is within the region. Gold has a high reflectivity, low radiation rate performance.

Gold alloy containing other elements can change the wavelength, that changes color.

Gold has a low recrystallization temperature characteristics.

2. King of the nuclear nature of the

Kim has 22 radioisotope. Only the atomic weight of 197 isotope of this gold is stable.

In the low case, the capture gamma rays released by the e-gold is the most important natural nuclear reaction. When the gold release of one child's energy is 5 eV, the capture cross section of the abnormal, goes to 20,000 target. Gold nuclei with large neutron capture cross section. Kim has the ability to absorb X-rays.

3. King of the chemical nature of the

High chemical stability of gold in alkaline and acid are all very stable. Not oxidized in the air, not color. Gold has excellent resistance to discoloration and chemical resistance.

Kim hydrogen, oxygen, nitrogen, clearly shows that insoluble. Oxygen does not affect its high temperature properties, which is all gold and other metals the most significant difference.

Gold can be dissolved in water, the king, but also dissolved in hydrochloric acid and chromic acid mixture, also can be dissolved in sulfuric acid and potassium acid mixture, and also can be dissolved in a solution of cyanide salts.

Gold compounds easily reduced to metal. High temperature hydrogen and potential pre-ordered in gold metal and hydrogen peroxide, tin dichloride, ferric sulfate, manganese dioxide as the reducing agent can be. Restore the ability to make the most gold metal is magnesium, zinc, iron and aluminum. You can also use a variety of organic matter to restore the money, such as formic acid, oxalic acid, acetylene, etc..