1, tin (element symbol Sn) is a metal element and an inorganic substance. White tin is usually a low melting point metal with silvery white luster. It is divalent or tetravalent in the compound and will not be oxidized by air at room temperature. In nature, it mainly exists in the form of dioxide (cassiterite) and various sulfides (such as cassiterite).

2. Tin is a famous "hardware"-one of gold, silver, copper, iron and tin. As early as ancient times, people discovered and used tin. In some ancient tombs in China, tin pots, tin candlesticks and other tin utensils are often excavated. According to research, in the Zhou Dynasty in China, the use of tin ware was very common. Tin daily necessities were also found in ancient tombs in Egypt.