Which metal is known for its malleability, ductility, and reddish-brown appearance?

Copper is known for its malleability, ductility, and reddish-brown appearance, which makes it distinctive among metals. Malleability refers to the ability of a material to be shaped or formed under compressive stress, and copper can be easily hammered or pressed into thin sheets without breaking. Ductility is the property that allows it to be stretched into a wire while retaining its strength, which is another characteristic feature of copper.

In addition to its mechanical properties, copper has a characteristic reddish-brown color that is easily recognizable. This coloration results from its specific placement on the periodic table and its tendency to form a range of oxides and salts with various hues.

The other metals mentioned have different properties that do not align with the features described. For example, iron is not known for its ductility to the same extent as copper and has a silvery-gray appearance. Aluminum is also malleable and ductile but has a shiny silver finish rather than a reddish-brown color. Gold, while malleable and ductile, has a distinct yellow hue. Thus, copper stands out as the metal that possesses all the mentioned characteristics.