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Journal Entry : November 25

Journal Entry : November 25. Using a periodic table, predict the charge ion each of the following elements form: calcium fluorine nitrogen aluminum Name the following ions: Li + S -2 Fe +3 Br -. Writing Formulas for Binary Ionic Compounds.

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Journal Entry : November 25

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  1. Journal Entry: November 25 • Using a periodic table, predict the charge ion each of the following elements form: • calcium • fluorine • nitrogen • aluminum • Name the following ions: • Li+ • S-2 • Fe+3 • Br-

  2. Writing Formulas for Binary Ionic Compounds Step #1: Write down ions and their charges. Step #2: Do the charges cancel? If yes, then that’s formulas. If no, then use “cross-over”. • Since compounds are neutral, the sum of the charges in an ion compound must be zero. • Examples: • calcium oxide • iron (III) chloride • barium nitride • aluminum sulfide

  3. Naming Binary Ionic Compounds • Identify the cation and anion in the formula. • Name each ion: • For monatomic cations, the name of the ion is the name of the element. If the cation is polyvalent, include a Roman numeral in the name. • Monoatomic anionsare named by dropping ending of element and replacing with the suffix –ide.

  4. Examples: • AlF3 • Mg3N2 • Cu2O

  5. Wrapping It Up • Reflect on what you have learned concerning the today’s topic. • Respond to the following… • What are the three most important things you learned today? • What is one question you would still like answered? • What is the one way what you have learned connects with what you knew before?

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