Beatrice Lang
Metals have a variety of electrical properties, including conductivity, resistance, permittivity, and permeability. Metals are highly conductive, meaning they can efficiently conduct electric current. The electrical conductivity of a metal is determined by the ease of movement of electrons past atoms under the influence of an electric field. Metals with high conductivity, such as copper, silver, gold, and aluminum, are widely used in electrical applications. On the other hand, materials with high resistance, such as glass, plastic, and silicone, are used as insulators. Metals also possess magnetic properties, with certain metals like iron, nickel, and cobalt exhibiting strong magnetism. The unique molecular structure of metals, characterized by closely packed layers of lattices, contributes to their exceptional electrical properties.
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What You'll Learn
Metals are highly conductive
Silver is the most electrically conductive metal, with a conductivity of 6.30×10^7 Siemens per metre. It also has the highest thermal conductivity and reflectivity. Silver was historically used in electrical wires and cables, but its use has been discontinued due to its low heat resistance, which posed a fire risk. Copper, the second most conductive metal, replaced silver in electrical applications. Copper is widely used due to its high conductivity, tensile strength, and resistance to corrosion, ensuring efficient power transmission with minimal heat loss.
Other metals with high electrical conductivity include gold, aluminium, and iron. Gold is preferred in high-quality electronics due to its high conductivity, resistance to tarnish, and mechanical resilience. However, its higher cost makes it less economical than other metals. Aluminium and iron also exhibit good electrical conductivity and are used in various electrical applications.
The electrical conductivity of a metal is influenced by factors such as cross-sectional area, length, and temperature. A larger cross-sectional area allows for a higher current flow, while a shorter conductor facilitates faster current flow. Additionally, as temperature rises, particle vibration and movement increase, hindering current flow and reducing conductivity.
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Metals are malleable
Metals are known for their electrical conductivity, a property that measures how easily electric current can pass through a material. This is due to their atomic structure, which allows for the movement of electrons. However, metals are also known for another important property: malleability.
Malleability is the ability of a material to deform without breaking when subjected to compressive stress, such as hammering or rolling. It is a measure of how easily a metal can be hammered or rolled into thin sheets. This property is a result of the unique nature of the atomic structure of metals and the type of chemical bonds that hold the atoms together. In metallic bonds, atoms are arranged in a tightly packed, crystalline structure, and the electrons in the outer shells are delocalized. This means that they are not bound to any specific atom but are free to move throughout the metal. This allows the atoms to slide past each other under force without breaking the bond, allowing the metal to change shape without fracturing.
The crystalline structure of metals plays a significant role in their malleability. Certain crystal structures, such as face-centred cubic (FCC) and hexagonal close-packed (HCP), allow for more slip planes. Slip planes are directions within the crystal lattice where atoms can easily slide past one another, making metals with these structures more malleable.
Temperature also influences the malleability of metals. Heating a metal generally increases its malleability by providing the atoms with more freedom to move, making it easier for the layers to slide over each other. This is why processes such as heating and alloying can be used to increase the malleability of metals like steel.
Gold and silver are known to be the most malleable metals. They can be easily beaten into thin sheets and wires, making them valuable for various applications, including jewellery, electronics, and decorative items.
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Metals are ferromagnetic
The electrical property of a metal is determined by its electrical conductivity, or its reciprocal, electrical resistivity. Electrical conductivity is the measure of how easily a material can conduct an electric current. Metals with high electrical conductivity include copper, silver, gold, and aluminum.
Now, onto the topic of ferromagnetism. Ferromagnetism is a property of certain materials that results in a significant magnetic permeability, allowing the material to form a permanent magnet. Metals that are ferromagnetic include iron, cobalt, nickel, and their alloys, as well as certain rare-earth metals. These metals have a unique crystalline structure and microstructure that result in many unpaired electrons in their d-block or f-block, which causes their magnetic properties.
When an electric current is passed through a coil of metal wire, a magnetic field is developed around the coil. Placing a piece of ferromagnetic metal, such as iron, inside the coil can increase the external magnetic field by up to 10,000 times. This phenomenon is the basis for many industrial applications and modern technologies, such as electromagnets, electric motors, and transformers.
Ferromagnetic materials can be classified as either soft or hard. Soft ferromagnetic materials, like annealed iron, have low coercivity and do not tend to stay magnetized, making them useful in electrical transformers. Hard ferromagnetic materials, on the other hand, have high coercivity and tend to retain their magnetism, making them useful as permanent magnets.
It is important to note that not all metals are ferromagnetic. Metals such as gold, silver, copper, and brass are not ferromagnetic and are instead classified as diamagnetic, meaning they are weakly repelled by magnets.
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Metals are resistant to tarnish
Metals have a unique set of electrical properties. The electrical conductivity of a metal is determined by how easily electrons can move past atoms under the influence of an electric field. Metals with high electrical conductivity include copper, silver, gold, and aluminium.
Tarnishing is a natural chemical reaction that occurs when metals react with substances in their environment, such as oxygen, sulphur, or moisture. This process forms a thin layer of corrosion on the surface of the metal, causing it to lose its shine and lustre. Tarnishing is not harmful to the metal, but it can be undesirable, especially for jewellery.
Some metals are more resistant to tarnishing than others. For example, gold in its pure form is famously unreactive and does not tarnish. However, gold jewellery is usually made from an alloy, and gold below 18 karats will tarnish due to the presence of other metals. Similarly, platinum does not tarnish but develops a patina over time, an oxidation layer that forms on the metal's surface. Titanium is another highly inert metal that is resistant to tarnishing and corrosion, even with prolonged exposure to moisture and air. Palladium is also highly inert and resistant to tarnishing, making it an ideal jewellery metal as it requires little maintenance.
To prevent tarnishing, proper storage and care are essential. Jewellery should be stored in airtight containers or anti-tarnish bags to minimise exposure to air and moisture. Silicone packets can also be placed in storage boxes to absorb excess moisture. Additionally, avoiding exposure to chemicals, such as perfumes and lotions, and regularly cleaning jewellery with a soft cloth can help slow down the tarnishing process.
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Metals are versatile
Metals are highly prized for their versatility. Their unique molecular structure, characterised by closely packed layers of lattices, gives them a range of valuable properties. Metals are the material of choice for various applications that drive global development.
Metals are good conductors of electricity. This is because their atoms have valence electrons, which are free to move across the lattices of atoms. The movement of these electrons passes electrical charge across the lattices, resulting in the conduction of electrical current. Metals with fewer valence electrons have stronger electrical conductivity, as there are fewer electrons to create resistance. Metals with high electrical conductivity include silver, copper, gold, and aluminium.
Metals are also good conductors of heat. Silver, for example, is the best conductor of heat. Metals with high thermal conductivity include copper and aluminium, while materials like wood and air have low thermal conductivity.
The molecular structure of metals also gives them strength and toughness. Metals can be hammered or rolled into thin sheets without breaking, making them a suitable material for protective covering for machines, electronic components, and structural platforms.
Metals also have magnetic properties. When an electric current is passed through a coil of metal wire, a magnetic field is developed around the coil. When a piece of ferromagnetic metal, such as iron, cobalt, or nickel, is placed inside the coil, the external field can increase 10,000 times. When the metal is removed from the coil, it retains some of this magnetism.
Additionally, metals are among the few types of elements that can easily combine with other elements to produce new materials. The material produced by combining two different types of metal is called an alloy.
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Frequently asked questions
Electrical resistivity is a property of a material that measures its electrical resistance or how strongly it resists electric current. The SI unit of electrical resistivity is the ohm-metre (Ω⋅m).
Electrical conductivity is the reciprocal of electrical resistivity. It represents a material's ability to conduct electric current. The SI unit of electrical conductivity is siemens per metre (S/m).
The main reason why metals are more electrically conductive is because their atoms have valence electrons. These are electrons in the outer shell of an atom that can freely move across the lattices of atoms. This movement passes electrical charge across the lattices, resulting in the conduction of electrical current.
Silver is the most electrically conductive metal, followed by copper.
Metals also have magnetic properties. When an electric current is passed through a coil of metal wire, a magnetic field is developed around the coil. Metals like iron, nickel, and cobalt show strong magnetic properties.
