Chemistry: Matter and Change

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CHEMISTRY Matter and Change
Chapter 7 Ionic Compounds and Metals.
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Table Of Contents
CHAPTER7
Section 7.2 Ionic Bonds and Ionic
Compounds Section 7.3 Names and Formulas for
Ionic Compounds
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Ionic Bonds and Ionic Compounds
SECTION7.2
Formation of an Ionic Bond

• The electrostatic force that holds oppositely
  charged particles together in an ionic compound
  is called an ionic bond.

• Compounds that contain ionic bonds are called
  ionic compounds.
• Binary ionic compounds contain only two different
  elementsa metallic cation and a nonmetallic
  anion.

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Ionic Bonds and Ionic Compounds
SECTION7.2
Formation of an Ionic Bond (cont.)
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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds

• When writing names and formulas for ionic
  compounds, the cation appears first followed by
  the anion.

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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds (cont.)

• A formula unit represents the simplest ratio of
  the ions involved.

• Monatomic ions are one-atom ions.

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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds (cont.)

• Oxidation number, or oxidation state, is the
  charge of a monatomic ion.

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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds (cont.)

• The symbol for the cation is always written
  first, followed by the symbol of the anion.

• Subscripts represent the number of ions of each
  element in an ionic compound.
• The total charge must equal zero in an ionic
  compound.

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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds (cont.)

• Polyatomic ions are ions made up of more than one
  atom.

• Since polyatomic ions exist as a unit, never
  change subscripts of the atoms within the ion.
  If more than one polyatomic ion is needed, place
  parentheses around the ion and write the
  appropriate subscript outside the parentheses.

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SECTION7.3
Names and Formulas for Ionic Compounds
Formulas for Ionic Compounds (cont.) Study and
memorize the 10 examples of polyatomic ions from
your copybook.
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SECTION7.3
Names and Formulas for Ionic Compounds
Names for Ions and Ionic Compounds (Cont.)

• Chemical nomenclature is a systematic way of
  naming compounds.

• Name the cation followed by the anion.
• For monatomic cations use the element name.
• For monatomic anions, use the root element name
  and the suffix ide.
• To distinguish between different oxidation states
  of the same element, the oxidation state is
  written in parentheses after the name of the
  cation.
• When the compound contains a polyatomic ion, name
  the cation followed by the name of the polyatomic
  ion.

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SECTION7.3
Names and Formulas for Ionic Compounds
Names for Ions and Ionic Compounds (Cont.)