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Ionic Bonds and Ionic Compounds

In many coastal countries that have warm, relatively dry climates, salt is produced by the evaporation of seawater. You will learn how cations and anions combine to form stable compounds such as sodium chloride.

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Ionic Bonds and Ionic Compounds

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Formation of Ionic Compounds

Formation of Ionic Compounds

What is the electrical charge of an ionic compound?

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Ionic Bonds and Ionic Compounds

> Formation of Ionic Compounds

Compounds composed of cations and anions are called ionic compounds.

Although they are composed of ions, ionic compounds are electrically neutral.

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Ionic Bonds and Ionic Compounds

> Formation of Ionic Compounds

Aluminum metal and the nonmetal bromine react to form an ionic solid, aluminum bromide.

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Ionic Bonds and Ionic Compounds

> Formation of Ionic Compounds

Ionic Bonds

The electrostatic forces that hold ions together in ionic compounds are called ionic bonds.

7.2

Slide 7 of 25

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Ionic Bonds and Ionic Compounds

> Formation of Ionic Compounds

Formula Units

• A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance.

• A formula unit is the lowest whole-number ratio of ions in an ionic compound.

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Slide 8 of 25

Ionic Bonds and Ionic Compounds

> Formation of Ionic Compounds

NaCl is the chemical formula for sodium chloride.

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Conceptual Problem 7.2

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Conceptual Problem 7.2

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Conceptual Problem 7.2

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Conceptual Problem 7.2

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Ionic Bonds and Ionic Compounds

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Properties of Ionic Compounds

Properties of Ionic Compounds

What are three properties of ionic compounds?

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Slide 14 of 25

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Ionic Bonds and Ionic Compounds

> Properties of Ionic Compounds

Most ionic compounds are crystalline solids at room temperature.

Ionic compounds generally have high melting points.

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Slide 15 of 25

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Ionic Bonds and Ionic Compounds

> Properties of Ionic Compounds

The coordination number of an ion is the number of ions of opposite charge that surround the ion in a crystal.

In NaCl, each ion has a coordination number of 6.

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Ionic Bonds and Ionic Compounds

> Properties of Ionic Compounds

Ionic compounds can conduct an electric current when melted or dissolved in water.

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