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Periodic Trends


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Periodic Trends

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