The chemical symbol Te, atomic number 52, is a silver white shiny quasi metallic element. Belonging to Group 16 (oxygen group) in the periodic table, it usually exists in a hexagonal crystal form and has a metallic luster. The melting point is 449.8 ℃, the boiling point is 989.9 ℃, and the density is between 6.1 and 6.27 grams per cubic centimeter. The chemical properties are similar to antimony, but more stable and not easily oxidized by air. It mainly exists in the form of sulfide minerals in nature, such as chalcopyrite and tellurides. It is usually extracted as a by-product in the copper ore smelting process. The main uses include as semiconductor materials.

The chemical symbol is Ag, with an atomic number of 47, and it is a white, glossy transition metal. The content in the crust is relatively low, mainly existing in the form of sulfide ores, and often coexisting with other metal ores. Known for its excellent conductivity, thermal conductivity, and reflectivity, it is a material second only to copper in electrical and thermal conductivity applications. These characteristics make it very important in the electronics industry, especially in high-precision instruments and high reliability circuits. Another important use is as a metal for investment and currency. Silver bars and silver coins are common forms for investors to preserve their value and invest in precious metals. In addition, silver is widely used in jewelry manufacturing.

The chemical symbol is Cu, with an atomic number of 29, and it is a red metallic element with high conductivity and thermal conductivity. It is relatively abundant in the Earth's crust and is one of the earliest metals used by humans, with a long history. Its physical properties make it widely used in various industrial fields. It is an indispensable material in electrical engineering, used for manufacturing wires, cables, and motors. The conductivity is second only to silver, but it is more common in practical applications due to its lower cost and ease of processing. In addition to electrical applications, copper is also used to manufacture pipes, roofing materials, coins, and various decorations. Equally important in both industrial and artistic fields

The chemical symbol is Sb, with an atomic number of 51, and it is a silver gray metallic element. The content in the Earth's crust is relatively low, mainly existing in sulfide minerals such as antimonite and antimonite. The physical properties are relatively unique, brittle at room temperature, but become soft and easy to process after heating. Low melting point, low conductivity and thermal expansion make it suitable for specific industrial applications. The main applications include manufacturing alloys, such as antimony lead alloys, to enhance the hardness and corrosion resistance of metals. Antimony as an additive can improve the performance of batteries, especially lead-acid batteries. In addition, it is also used in the production of flame retardants.

Bismuth is a chemical element with the chemical symbol Bi, atomic number 83, and atomic weight 208.98040 u. Bismuth is a poor metal with chemical properties similar to arsenic and antimony, both belonging to the nitrogen group. Bismuth can be found in nature, and its sulfides and oxides are important commercial ores. The density of pure bismuth is 86% of that of pure lead. When it is first produced, it is a silver white brittle metal, but its surface turns pink after oxidation. Bismuth is a natural diamagnetic metal and one of the elements with the lowest thermal conductivity among metals.