Chemistry of Metals and Alloys

Copper is widely accepted as the first metal discovered and used by humans, marking the beginning of the Copper Age.

Aluminium is the most abundant metal in the Earth's crust, making up about 8 percent of the crust by weight. Iron is the second most abundant metal.

Silver has the highest thermal conductivity of any metal. Copper is also an excellent conductor, but silver ranks first.

Silver possesses the highest electrical conductivity of all metals, surpassing copper and gold. Its atomic structure allows electrons to move with minimal resistance. Although copper is more commonly used in wiring due to cost, silver remains the best electrical conductor.

Lead is a poor conductor of heat compared to other common metals like copper, aluminium, and silver.

Ductility is the ability of a material to be drawn into a thin wire. Gold is widely recognized as the most ductile metal, as a single gram can be drawn into a wire several kilometers long.

German silver is a misnomer, as it contains no silver. It is an alloy composed of copper, zinc, and nickel, known for its silvery appearance and corrosion resistance.

Mercury is a chemical element with the symbol Hg and is the only metallic element that is liquid at standard temperature and pressure.

Gold is the most ductile metal, capable of being drawn into extremely thin wires without breaking. This property is due to its metallic bonding structure.

Mercury is a transition metal. Carbon is a non-metal, and silicon is a metalloid.

Sodium and potassium are alkali metals that are soft enough to be cut with a knife. Since both are correct, option C is the appropriate choice.

Both Gallium and Cesium have very low melting points. Gallium melts at approximately 29.76 degrees Celsius, and Cesium melts at approximately 28.44 degrees Celsius, making both capable of melting in or near human hand temperatures.

Osmium is the densest naturally occurring stable element on the periodic table.

Lithium is the lightest metal and the lightest solid element in the periodic table, with an atomic number of 3.

Copper was the first metal discovered and used by humans, marking the transition from the Stone Age to the Chalcolithic Age.