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Formula Units for Ionic Cpds

Formula Units for Ionic Cpds. Not atoms but a ratio of ions, so not a formula but a formula unit Charge = 0 Form a crystal lattice not a molecule Each ion’s charge = oxidation number Cation is always first; anion is second. Monoatomic Ions. A one atom ion.

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Formula Units for Ionic Cpds

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  1. Formula Units for Ionic Cpds Not atoms but a ratio of ions, so not a formula but a formula unit Charge = 0 Form a crystal lattice not a molecule Each ion’s charge = oxidation number Cation is always first; anion is second

  2. Monoatomic Ions • A one atom ion. • Two monoatomic ions = binary compound • KCl MgCl2 Na3Cl

  3. Polyatomic Ions • More than 1 atom but act like 1 ion • Usually OXYANIONS • Have 1 oxidation number • Use parenthesis to show more than 1 • Never change the subscripts w/in the p.a. ion • Ex: sulfuric acid = H2SO4 magnesium chlorate Mg(ClO3)2 (use table 8.6 on pg. 224)

  4. Quick Check • What’s the correct formula for: • Sodium hydrogen-carbonate • Magnesium hydroxide • Ammonium nitrate • Ammonium oxide • Hydrogen peroxide • Calcium phosphate

  5. Naming Ionic Cpds • Cation first; anion second • Monoatomic anion = -ide • Polyatomic ion = look up name on chart • Cations = use element’s name • Transition metals = include Roman numerals

  6. Quick Check • Name the following: • AgNO3 • CuCrO4 • KI • Ca(ClO4) 2

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