Chemistry of Metals and Alloys

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.

Photographic plates and films are coated with a light-sensitive emulsion containing silver bromide, which decomposes upon exposure to light.

Lead pencils do not contain the element lead; they contain a mixture of graphite and clay. Graphite is the material that leaves marks on paper.

Tungsten has an extremely high melting point (about 3422 degrees Celsius), which allows it to glow white-hot without melting when an electric current passes through it. This property makes it ideal for incandescent bulb filaments.

Gold is the most malleable and ductile metal, meaning it can be beaten into extremely thin sheets without breaking.

Platinum has a very high density (approximately 21.45 g/cm^3), which is significantly higher than that of lead or iron.

The core of a transformer is made of soft iron to provide a low-reluctance path for the magnetic flux, which increases the efficiency of the magnetic coupling between the primary and secondary coils.

Tungsten has the highest melting point of all metallic elements and is exceptionally hard. It is frequently used in alloys to increase hardness and durability.

Flash bulbs contain a thin wire or foil made of magnesium. When ignited in an oxygen-rich environment, it burns rapidly, producing a bright flash of light.