Ionic Bonds

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Chapter 7

• Ionic Bonds

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• Ionic Bonds Video

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Chemical Bonds

• force that holds two atoms together (either by
  sharing or transferring electrons)

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Ionic Bonds

• bond composed of charged particles (formed by
  losing or gaining electrons) that are
  electrostatically held together

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Properties of Ionic Bonds

• ions are held together in a crystal lattice (3D
  geometric arrangement of particles)
• solids
• high melting and boiling points
• will conduct electricity when dissolved in water
• Video- crystal lattice

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Ions

• charged particle (from losing or gaining
  electrons)
• Cationpositively charged particles formed by
  losing electrons
• Anionnegatively charged particles formed by
  gaining electrons

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• What are cations afraid of?
• Dogions. Ha.Ha.Ha.Ha.Ha.

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• Monoatomic Ion ion made of one type of atom
• Ex.  Na
• O-2
• Polyatomic Ion ion made of more than one type
  of atom
•   Ex. CO3-2

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Oxidation Number

• the charge on the atoms or group of atoms
• Group 1 1
• Group 2 2
• Group 13 3
• Group 16 -2
• Group 17 -1

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Chemical Formula

• Combination of symbols that represent the
  composition of a compound
• (compound chemical combination of two or more
  elements)
• -shows relative number of atoms of each element
  and types of elements involved.
• Subscript of atoms of that element

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Writing ionic formulas

• 1. Find the oxidation numbers of both ions
  (chart or p. 218-221) and symbols
• 2. Add atoms so that the total charge adds up to
  zero (may have to use least common multiple)

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1. Combine symbols and subscripts together , cation
   first then anion (use parentheses around
   polyatomics and NO roman numerals after lead,
   iron, copper and tin)
2. Sodium and chlorine love story

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Sodium oxide
-2
Na
1
O
You need two 1 sodium ions to add up to the 2
charge on the oxygen ion to make the compound add
up to zero
Na 1 Na 1
O-2
Na2O
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Iron (III) sulfate
SO4 -2
Fe 3
-Least common multiple 6 -Need 2 iron ions, 3
sulfate ions
Fe 3 Fe 3
SO4-2 SO4-2 SO4-2
Fe2(SO4)3
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• Aluminum sulfide
• Barium chloride
• Lead (II) nitrate
• Ammonium phospate

• Al2S3
• BaCl2
• Pb(NO3)2
• (NH4)3PO4

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Naming Ionic Compounds

• 1. Name the cation as it is written on the
  periodic table (except ammonium)
•  
• 2. Add roman numeral in parentheses if lead,
  iron, copper or tin.

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• 3. Anion-
• Monoatomic change ending to ide
• (Ex. Oxygen gt oxide)
•  Polyatomic keep ending as written.
• (Ex. Carbonate)
•  
• 4. Common acids dont follow these rules.

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MgI2
Magnesium iodide
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SnCO3
Tin (II) carbonate