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Chapter 2 The Material World
Molecules Chapter 2 The Material World
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Forming Ionic Compounds (Simple)
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What are ionic compounds?
Ionic compounds are compounds formed between a metal and a non-metal Metals lose electrons Non-metals gain electrons 2+ 2- Mg S
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NaCl Na Cl Na Cl - + Examples: Ionic Bonds
Draw the Lewis dot diagram to show the bond between sodium and chlorine. Na Cl NaCl - + Na Cl
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Li2O Li O Li Li O + Examples: Ionic Bonds 2-
Draw the Lewis dot diagram to show the bond between Lithium and Oxygen. Li O Li Li2O 2- + Li O
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Mg N N N Mg3N2 Mg Mg Mg 2+ Examples: Ionic Bonds 3-
3. Draw the Lewis dot diagram to show the bond between magnesium and nitrogen. N Mg Mg Mg N Mg3N2 2+ 3- Mg N
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Mg+2 Cross Over Method Mg 12p+ +12 10e- -10 +2 2 valance e-
Wants to lose 2 e- to achieve full octet If Mg loses 2 e- now has 12p+ and 10e- Mg+2 12p+ 10e- +12 -10 +2
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F-1 Cross Over Method F 9p+ +9 10e- -10 -1 7 valance e-
Wants to gain 1e- to achieve full octet If F gains 1 e- now has 9p+ and 10e- F-1 9p+ 10e- +9 -10 -1
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Mg+2 F-1 Mg1F2 Do not have to show “1”
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+2 F -1 Mg 1 2 Do not have to show “1” MgF2
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Examples: Al+3 S-2 Al2S3
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Ca+2 O-2 Ca2O2 Ca1O1
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