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CPO Science Integrated Physics & Chemistry Chapter 19.2 Chemical Formulas Developing A Model Why is the periodic table of elements arranged this way? Read Part 1 of the investigation Developing A Model What is an element’s oxidation number? — Electrons gained of lost to become a stable ion Atoms Valence Electrons K Mg Al P Se Br Ar Electron gained or Valence lost during Electrons ionization After Oxidation Number 1 2 3 1 lost 2 lost 8 8 +1 +2 3 lost 8 +3 5 3 gained 8 -3 6 2 gained -2 7 1 gained 8 0 gained 8 8 8 -1 0 Key Questions Why do atoms combine in certain ratios? What role does oxidation numbers play? How do you name compounds? Developing An Experiment What happens when a positive ion comes in contact with a negative ion? — Opposites attract — What charge does a Na ion have? How do you know? — What charge does a Cl ion have? How do you know? — Together they make? The compound NaCl Run The Experiment Tips Complete the chart for part 2. Make sure to use the the tiles. Remember the oxidation numbers must add to zero What did you learn? What role do the oxidation numbers play in creating a compound? Why didn’t lithium & argon create a compound? What did you notice about the ratio of MgS? — It was the lowest ratio Naming Compounds These are the rules for ionic compounds. Now name the compounds you created in part 2 Summary What are oxidation numbers? Why do atoms combine in certain ratios? How do you name ionic compounds?