What is shiny malleable and conducts electricity?
Many metals are shiny, ductile, and malleable. They are also good conductors of heat. Almost all metals are solids are room temperature. Nonmetals are elements that do not conduct electricity.
Metals are a common type of ductile material. Copper, aluminum, and steel are examples of ductile metals. The opposite of ductility is brittleness, where a material breaks when tensile stress is applied to lengthen it. Examples of brittle materials include cast iron, concrete, and some glass products.
- Ductility is a physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking. A ductile substance can be drawn into a wire. Examples: Most metals are good examples of ductile materials, including gold, silver, copper, erbium, terbium, and samarium.
- Metals are described as malleable (can be beaten into sheets) and ductile (can be pulled out into wires). This is because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.
- Malleable Iron is rarely specified anymore because ductile iron offers better properties at comparable costs. Cast iron is a family of metals that are iron-carbon-silicon alloys containing more than 2% carbon (C), usually 1 - 3% silicon (Si) and a few other elements for various purposes.
Currently the Guinness World Record database has listed gold as “Most ductile element”. However, somebody brought to their attention that it is platinum that should have this record and not gold. The record states: “One gram of gold (Au) can be drawn to 2.4 km, or 1 oz to 43 miles.”
- Copper wire is heavier, and aluminum is lighter and silver grey. The other main difference between copper and aluminum wires is the resistance of the material. Copper not only has a higher conductivity than aluminum, but is more ductile, with relatively high tensile strength, and can be soldered.
- Although it is the best conductor, copper and gold are used more often in electrical applications because copper is less expensive and gold has a much higher corrosion resistance. Most metals conduct electricity. Other elements with high electrical conductivity, are aluminum, zinc, nickel, iron, and platinum.
- Gold is extremely ductile-meaning that it can be drawn out into wire or threadlike forms without becoming brittle and breaking. It is said that gold can be drawn out so thin that a single ounce could be made to stretch a continuous length of 35 miles. Gold is extremely dense, one of the heaviest of all metals.
Mild steel shows a ductile-brittle transition at around -60 °C. Results for aluminium show that it become slightly less ductile as the temperature is increased, and all the values for impact energy lie between the ductility of copper and the brittleness of acrylic.
- Metals are good conductors of electricity and heat, because the free electrons carry a charge or heat energy through the metal. The free electrons allow metal atoms to slide over each other, so metals are malleable and ductile.
- Ductility is the ability to be drawn out into a wire. Malleability is the ability to be hammered out into a sheet. Copper is not a particularly hard metal, and it keeps a very poor edge, but it can be alloyed with tin to form bronze, which has excellent tool making properties.
- Unlike iron and steel, aluminium does not rust or corrode in moist conditions. Its surface is protected by a natural layer of aluminium oxide. This prevents the metal below from coming into contact with air and oxygen.
Updated: 6th December 2019