1. Chapter 7 Ionic and Metallic Bonding 7.3 Bonding in Metals 7.1 Ions
7.2 Ionic Bonds and
Ionic Compounds
7.3 Bonding in Metals
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2. Magnesium and Fluorine Calcium and Sulfur Potassium and Nitrogen
Do Now
Write the formula of the ionic compound formed when the following elements combine:
Sodium and Chlorine
Lithium and Oxygen
Magnesium and Fluorine
Calcium and Sulfur
Potassium and Nitrogen
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3. Metallic Bonds and Metallic Properties
Metallic bond is a sharing of electrons between many atoms of a metal element.
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4. Metallic Bonds and Metallic Properties
The valence electrons of atoms in a pure metal can be modeled as a sea of electrons.
The valence electrons are mobile and can drift freely from one part of the metal to another.
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5. Metallic Bonds and Metallic Properties
Metallic bonds are the forces of attraction between the free-floating valence electrons and the positively charged metal ions.
These bonds hold metals together.
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6. Metallic Bonds and Metallic Properties
Properties of Metals
Conductors of electric current
electrons can flow freely in the metal.
Ductile: can be drawn into wires
Malleable: can be hammered or pressed
When subjected to pressure, cations slide past one another
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7.
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8. Alloys
Alloys
Mixtures of two or more elements, at least one of which is a metal.
Brass is an alloy of copper and zinc.
Properties are often superior to those of their component elements
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9. The most important alloys today are steels.
The principal elements in most steels, in addition to iron and carbon, are boron, chromium, manganese, molybdenum, nickel,
tungsten, and vanadium.
Stainless Steel
80.6% Fe
18.0% Cr
0.4% C
1.0% Ni
Steels have a wide range of useful properties, such as corrosion resistance, ductility, hardness, and toughness.
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10. END OF 7.3
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