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. Properties of Ionic Compounds
Most are crystalline solids
at room temperature.
High Melting Points
Composed of a metal & nonmetal
Can conduct electric current when melted or dissolved in water
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3. Formation of Ionic Compounds
Ionic compounds are not discrete units, but collections of positively and negatively charged ions arranged in repeating patterns.
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4. Formation of Ionic Compounds
The structure of an ionic compound is called a crystalline structure.
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5. https://phet. colorado
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6. Properties of Ionic Compounds
Ionic compounds conduct electric current when dissolved in water.
When dissolved, the ions are free to move about in the solution.
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7. Properties of Ionic Compounds
When sodium chloride is melted, the orderly crystal structure breaks down.
To (+) electrode
To (–) electrode
Inert metal electrodes
Flow of electrons
Current meter
Power source
Cl–
Na+
This movement of electrons allows electric current to flow between the electrodes through an external wire.
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8. Comparing Molecular and Ionic Compounds
Water
Molecular Compound
Sodium Chloride
Ionic Compound
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9. Comparing Molecular and Ionic Compounds
Properties of Molecular Compounds
Composed of two or more nonmetals
Lower melting and boiling points
Solids, liquids or gases at room temp.
Do not conduct electricity
Do not dissolve in water as well as ionic compounds
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10.
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11. Metallic Bonds and Metallic Properties
Formed between two or more cations (metals).
Valence electrons are mobile. They move around and are shared by all atoms.
Modelled as a “sea of electrons”
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12. 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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13. Alloys Mixtures of elements with at least one metal
Properties are superior to its components
Corrosion resistance
Ductility
Hardness
Toughness
Examples
Brass = Cu + Zn
Steel = Fe + C + B,Cr,Mn,Mo,Ni,W,V
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14. END OF 7.3
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