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Periodic  Trends
Periodic  Trends
Periodic  Trends
Periodic  Trends
Periodic  Trends
Periodic  Trends
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Periodic Trends

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Transcript

  • 1. Polyatomic Nomenclature Naming Polyatomic and Writing Formulas from Names
  • 2. Polyatomic Ions
    • Ions that are made up of more than one element
    • The elements stay together and act as one unit in chemical reactions
    • Together the elements still carry a charge
  • 3.  
  • 4. Writing Formulas From Names
    • Identify the Anion
    • Identify the Cation
    • Determine the total number of cations and anions needed to make the formula electrically neutral (these become the subscripts)
    • You must use parenthesis if there is more than one polyatomic ion needed for the formula
    • Write the formula, putting the cation first, then the anion
  • 5. How does that work?
    • Sodium Phosphate: Na + + PO 4 3- = Na 3 PO 4
    • Magnesium Phosphate: Mg 2+ + PO 4 3- = Mg 3 (PO 4 ) 2
  • 6. Polyatomic Ionic Compounds
    • Identify and name the cation
    • Identify and name the anion (often the polyatomic ion)
    • Put the names together, naming the cation first, then the anion

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