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Ionic Formulas

Ionic Formulas. What are ions?. Review: What’s the difference between monatomic and polyatomic ions?. Monatomic Ion – ion with only one element. Polyatomic Ion – ion with more than one element. WARNING!. We’re going to start out with JUST MONATOMIC IONS.

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Ionic Formulas

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  1. Ionic Formulas

  2. What are ions? • Review: What’s the difference between monatomic and polyatomic ions? Monatomic Ion – ion with only one element Polyatomic Ion – ion with more than one element

  3. WARNING! • We’re going to start out with JUST MONATOMIC IONS. • We’ll work on POLYATOMIC IONS later.

  4. Ionic Compound Ionic Compound – a compound in which positive and negative ions attract each other to keep matter together - Overall charge of the compound is neutral

  5. Ionic Formula • How do we represent an ionic compound? Ionic Formula – Similar to a chemical formula, this shows what ions (AND how many of each ion) are in an ionic compound

  6. Writing Ion Practice Look at the ions and formulas listed below. Do you notice any patterns?

  7. Writing Formulas – Equal Charges If the cation and anion charge are the same value: Drop the charges and write the elements Cation first, then anion

  8. Writing Formulas – Equal Charges Example 1) Lithium Fluoride LiF Li+ F-

  9. Writing Formulas – Equal Charges Example 2) Magnesium Oxide MgO Mg2+ O2-

  10. Writing Formulas – Different Charges If the cation and anion charge are not equal, 1 cation and 1 anion will not form a neutral compound.

  11. Writing Ionic Formulas STEP EXAMPLE Aluminum Chloride Al3+Cl- 1) Write the cation first, then the anion.

  12. Writing Ionic Formulas STEP EXAMPLE Aluminum Chloride Al3 Cl1 2) Drop the + and – (but NOT the numbers!!)

  13. Writing Ionic Formulas STEP EXAMPLE Aluminum Chloride Al3 Cl1 3) Cross the charges. Al1Cl3

  14. Writing Ionic Formulas STEP EXAMPLE Aluminum Chloride Al1Cl3 4) Drop any “1”. AlCl3

  15. Writing Ionic Formulas STEP EXAMPLE Beryllium Nitride Be2+ N3- 1) Write the cation first, then the anion.

  16. Writing Ionic Formulas STEP EXAMPLE Beryllium Nitride Be2 N3 2) Drop the + and – (but NOT the numbers!!)

  17. Writing Ionic Formulas STEP EXAMPLE Beryllium Nitride Be2N3 3) Cross the charges. Be3N2

  18. Writing Ionic Formulas STEP EXAMPLE Beryllium Nitride Be3N2 4) Drop any “1”. Be3N2

  19. Writing Ionic Names Rule:Cation is written as its element’s name. Anion name ends in –ide. **Sometimes we have to figure out the name from the formula. Given the ionic formula, work backwards to figure out the ions.

  20. Names – Example 1 CaBr2 Ca2+ Br- Calcium Bromide

  21. Names – Example 2 CoI3 Co3+ I- Cobalt (III) Iodide

  22. Names – Example 3 CuS Must have the same charge: Cu2+ S2- Copper (II) Sulfide

  23. Group Practice • There are 11 stations around the room. Find them all, and write the ionic formula and name for each in your notebook. • You will need to bring your Ion Chart with you, since some of the ions are written with NAMES, others with SYMBOLS

  24. Group Practice - Check

  25. Group Practice - Check

  26. Group Practice - Check

  27. Group Practice - Check

  28. Independent Practice • Fill out the Monatomic Ions Practice

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