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 Mn, with an atomic number of 25, and it is a gray white, hard, and brittle transition metal. It is relatively abundant in the Earth's crust and is the twelfth most abundant element. In nature, it usually exists in the form of compounds, such as manganese ore, mainly including manganese carbonate, manganese oxide, and manganese silicate. It has a wide range of applications in industry, especially in steel production, which can improve the strength and hardness of steel while enhancing its processing performance. Adding can prevent corrosion and wear of steel, thus playing an important role in the manufacturing of wear-resistant steel, stainless steel, and alloy steel. It is also used to manufacture products such as dry batteries, dyes, glass, and ceramics.