Solder:
Solder is an alloy used for joining or bonding metal surfaces together. It is typically made from a combination of tin and lead. The ratio of tin to lead can vary depending on the specific application and desired properties of the solder. Solder is commonly used in electronics, plumbing, and metalwork.

Bronze:
Bronze is an alloy composed primarily of copper, with the addition of other elements such as tin, aluminum, or silicon. The addition of these elements improves the strength, hardness, and corrosion resistance of bronze. It is commonly used in sculptures, musical instruments, and architectural applications.

Steel:
Steel is an alloy of iron and carbon, with the addition of other elements such as manganese, chromium, or nickel. The carbon content in steel is typically less than 2%. The presence of these elements enhances the strength, durability, and corrosion resistance of steel. It is widely used in construction, automotive, and manufacturing industries.

Stainless Steel:
Stainless steel is a type of steel alloy that contains a high amount of chromium. The chromium content provides stainless steel with excellent resistance to corrosion and rust. It also contains other elements such as nickel and molybdenum, which further enhance its corrosion resistance and mechanical properties. Stainless steel is commonly used in kitchen appliances, cutlery, medical equipment, and architectural applications.

Brass:
Brass is an alloy composed primarily of copper and zinc. The ratio of copper to zinc can vary, resulting in different types of brass with varying properties. Brass is valued for its attractive golden appearance and excellent formability. It is used in musical instruments, plumbing fittings, decorative items, and electrical components.

Mercury:
Mercury is not an alloy but rather a chemical element with the symbol Hg and atomic number 80. It is a heavy, silvery-white liquid at room temperature. Mercury is known for its high density and low melting point, making it useful in thermometers, barometers, and other scientific instruments. However, due to its toxicity, the use of mercury has been significantly reduced in recent years.