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Lewis Diagrams for Polyatomic Ions

Lewis Diagrams for Polyatomic Ions. Polyatomic Ions. Polyatomic ions are covalently bonded atoms that together have an overall charge. Lewis diagrams for polyatomic ions:. Determine the # of valence e- for each atom in the molecule and draw the dot diagram as if it were covalent BUT

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Lewis Diagrams for Polyatomic Ions

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  1. Lewis Diagrams for Polyatomic Ions

  2. Polyatomic Ions Polyatomic ions are covalently bonded atoms that together have an overall charge.

  3. Lewis diagrams for polyatomic ions: • Determine the # of valence e- for each atom in the molecule and draw the dot diagram as if it were covalent BUT • SUBTRACT one electron (usually from the central atom) for each +ve charge. • ADD one electron (usually from the central atom) for each -ve charge.

  4. Draw the Lewis structure for the following:CHO21- Determine the central atom (the one with the most bonding electrons: Carbon 4 e- Hydrogen 1 e- Oxygen 2 e- per atom So the central atom will be? C

  5. Draw the Lewis structure for the following:CHO21- C

  6. Draw the Lewis structure for the following:CHO21- H C Don’t forget to add the –1 charge

  7. Draw the Lewis structure for the following:CHO21- H C O O

  8. Draw the Lewis structure for the following:CHO21- 1- H C O O

  9. Draw the Lewis structure for the following:CHO21- 1- H C O O Octet rule satisfied for every atom Don’t forget the brackets and the charge!!!

  10. NH4+ Determine the central atom:

  11. NH4+ N Remember to take one away for the +1 charge

  12. NH4+ H H N H H

  13. NH4+ + H H N H H

  14. CO32-

  15. CO32- C

  16. CO32- C Add in the two extra electrons!!!!

  17. CO32- C O

  18. CO32- O C O O

  19. CO32- 2- O C O O Don’t forget the brackets and the charge!!!

  20. Where do the electrons for the charge come from in a polyatomic dot diagram? They are transferred from a metal. Which means polyatomic dot diagrams involve both ionic and covalent dot diagrams.

  21. Draw the dot diagram for NaCNO First draw the dot diagram for the polyatomic. Na1+ CNO1-

  22. CNO1-

  23. CNO1- 1- O C N

  24. CNO1- 1- O C N Now finish the ionic dot diagram by drawing the dot diagram for the metal.

  25. NaCNO 1- [ Na ] +1 O C N

  26. Recall Ionic Dot Diagrams Draw the dot diagram for NaBr.

  27. NaBr Na Br

  28. NaBr [ Na ] +1 [ Br ] -1

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