Gold is an English word, noun and adjective. When used as a noun, it means "gold, gold". Gold. When used as an adjective, gold coin means "gold, made of gold". Golden. "Pronunciation: English [ω LD], American [ωO? ld].

Phrase collocation: gold bars, gold ingots, gold bricks, investment gold bars. Gold typhoon, gold gale, gold breeze, nirvana, small town incident. Paper gold paper gold, special drawing rights, special drawing rights, special drawing rights.

Gold is a metallic element with symbol Au and atomic number 79. The simple substance (free form) of gold, commonly known as gold, is a precious metal, which has been used as currency, preservation and jewelry for many centuries. In nature, gold exists in the form of simple substance in gold nuggets or rocks, underground veins and alluvium.

Gold is a transition metal, which can form +3 and+1 valence compounds. Gold is chemically inactive, but it can be corroded by chlorine, fluorine, aqua regia and cyanide. Gold can be dissolved by mercury to form gold amalgam. Nitric acid that can dissolve silver cannot dissolve gold. The above two properties become the basis of gold refining technology, which are called "adding silver to divide gold" and "separating gold from silver" respectively.

The use of gold:

1. Gold is used to make coins and jewels. Because pure gold is too soft, base metals such as gold will alloy with metals such as copper to increase hardness. Gold is used to make jewelry, which is beautiful, durable and light, and has become a precious symbol of wealth.

2. Gold is widely used as an international reserve because of its monetary commodity properties, excellent characteristics and functions of money.

3. As a personal investment, gold keeps the value and, in the period of economic stability, people's interest in gold is not great. There is no interest income from simply storing gold in Qian Qian, and it is necessary to pay a safekeeping fee, which can only be regarded as a hobby of gold collection.

4. Gold is widely used in industry and high-tech industry because of its high corrosion resistance, good electrical and thermal conductivity, and easy processing into ultra-thin gold foil, micron gold thread and gold powder.

5. As money, gold is mainly used to make edible foods such as golden radish and golden apple, and also has health care functions such as quenching thirst and skin care.