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Transition Metals, Alloys and Corrosion, Study notes of Chemistry

An overview of transition metals, their properties, and their uses. It also discusses alloys, which are mixtures of two or more elements, at least one of which is a metal. Alloys can be designed to have specific properties, such as increased strength or improved corrosion resistance. how the properties of an alloy depend on the proportions of the elements used to make it.

Typology: Study notes

2020/2021

Available from 01/08/2023

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Transition Metals, Alloys and Corrosion
Transition Metals
The transition metals are a group of elements found in the periodic
table. They are located in the d-block of the periodic table, which
consists of the groups 3 through 12. The elements in this group are
characterised by the fact that they have partially filled d-orbitals in their
ground state, which means that they can exhibit multiple valences or
oxidation states.
There are several properties that are characteristic of transition metals.
One is their high melting and boiling points, which is due to the fact
that they have strong metallic bonds between their atoms. They also tend
to be good conductors of heat and electricity. Transition metals also have
a high density and are generally hard and strong.
One interesting property of transition metals is that they can form
complex ions, which are ions with a central metal atom bonded to a
group of ligands. Ligands are molecules or ions that donate electrons to
the metal, and they can be either monodentate (meaning they bond to
the metal through a single atom) or polydentate (meaning they bond to
the metal through multiple atoms). Complex ions can have different
structures and properties depending on the nature of the ligands and the
oxidation state of the metal.
Transition metals are also known for their ability to form coloured
compounds. This is due to the presence of unpaired electrons in the
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Transition Metals, Alloys and Corrosion

Transition Metals

The transition metals are a group of elements found in the periodic table. They are located in the d-block of the periodic table, which consists of the groups 3 through 12. The elements in this group are characterised by the fact that they have partially filled d-orbitals in their ground state, which means that they can exhibit multiple valences or oxidation states. There are several properties that are characteristic of transition metals. One is their high melting and boiling points, which is due to the fact that they have strong metallic bonds between their atoms. They also tend to be good conductors of heat and electricity. Transition metals also have a high density and are generally hard and strong. One interesting property of transition metals is that they can form complex ions, which are ions with a central metal atom bonded to a group of ligands. Ligands are molecules or ions that donate electrons to the metal, and they can be either monodentate (meaning they bond to the metal through a single atom) or polydentate (meaning they bond to the metal through multiple atoms). Complex ions can have different structures and properties depending on the nature of the ligands and the oxidation state of the metal. Transition metals are also known for their ability to form coloured compounds. This is due to the presence of unpaired electrons in the

d-orbitals of the metal atoms, which can absorb certain wavelengths of light and cause the compound to appear a particular colour. This property is used in a number of applications, such as the production of pigments for paints and dyes. Transition metals have a wide range of uses in various fields, including metallurgy, chemistry, and biology. Some common examples of transition metals include copper, iron, nickel, and titanium.

Alloys

An alloy is a mixture of two or more elements, at least one of which is a metal. Alloys are usually made by combining a metallic base element with one or more other elements in order to give the resulting material specific properties that are different from those of the base element. Alloys are used in a wide range of applications, from everyday household items to advanced industrial and technological products. They can be designed to have a variety of different properties, such as increased strength, improved corrosion resistance, enhanced electrical conductivity, and improved wear resistance. There are many different types of alloys, and the specific properties of an alloy depend on the proportions of the elements that are used to make it, as well as on their characteristics. For example, steel is an alloy made from iron and carbon, and it is known for its strength and durability. Brass, on the other hand, is an alloy made from copper and zinc, and it is known for its good conductivity and its ability to produce a distinctive golden colour.

gaps on the surface of a material. Galvanic corrosion is a type of corrosion that occurs when two different metals are in contact with each other in the presence of an electrolyte, causing one of the metals to corrode more quickly than it would otherwise. There are several factors that can contribute to corrosion, including the chemical composition of the material, the nature of its environment, and the presence of stress or strain on the material. Some common environmental factors that can contribute to corrosion include humidity, temperature, and the presence of certain chemicals or pollutants. Corrosion can be prevented or slowed down through the use of corrosion-resistant materials or coatings, as well as through the use of proper design and maintenance practices. In some cases, corrosion can be mitigated through the use of corrosion inhibitors, which are chemicals that react with the corrosion products to form a protective layer on the surface of the material.