1. Chapter 12.2

2. Standards: GLE 0807.9.2 GLE 0807.9.4 GLE 0807.9.6

3. Key concepts: Explain how ionic bonds form. Describe how positive ions form. Describe how negative ions form. Explain why ionic compounds are neutral.

4. Key Vocabulary: Ion Ionic bond

5. Ionic Bond: Ionic bonds form when electrons are transferred from one element to another – Ionic bonds occur between metals and non-metals Ionic bonds have the following properties: – High melting and boiling points – Can be brittle in solid state – Think salt What is a compound? What is a bond? Completely the opposite of ionic bonds

6. Ionic Bond: Ionic bonds: – Atoms are neutral because protons and electrons are equal – Transfer of electrons change the number of electrons for each element – Create ions: charged particles that are formed when atoms gain or lose electrons Atoms must be close to each other for them to gain or lose – Created compounds are NEUTRAL What is a compound? What is a bond? What is an ion?

7. Picture time! For Metals…

8. Picture time! For Non-metals…

9. Lewis Dot Structures Metal must become a cation by giving up an electron. Nonmetal must receive an electron and become an anion. The ionic bond is an electrostatic attraction between the positive and negative ion Cl Na Sodium atomChlorine atom Na + Sodium chloride Cl -

10. Lewis Dot Structures Ion – an atom or group of atoms with a charge ( + or - ). – Cation – positive ion formed from a metal giving up 1-3 electrons – Anion – negative ion formed from a nonmetal gaining 1-3 electrons. Mg 2+ Cl - MgCl 2 Mg

11. Lewis Dot Structures Oxidation Number - a “ + ” or “ - ” number given to an atom or group of atoms that represent the number of electrons that have been given (+) or received (-). X XXXXXXX +1 +2+3-3-2 0 -4-4 + He

12. Picture time! For Metals…

13. Picture time! For Non-metals…

14. Ionic Bond: Energy Talk: – When Metals lose electrons, it requires energy Always metals Will always be POSITIVE ions – When Non-metals gain electrons, it gives off energy Non-Metals always will be NEGATIVE When written, end in -ide What is a compound? What is an ion?

15. Pearls of Wisdom: An ionic bond is a bond that forms when electrons are transferred from one atom to another. During ionic bonding, the atoms become oppositely charged ions. Ionic bonding usually occurs between atoms of metals and atoms of nonmetals. Energy is needed to remove electrons from metal atoms. Energy is released when most nonmetal atoms gain electrons. An ionic bond is a bond that forms when electrons are transferred from one atom to another. During ionic bonding, the atoms become oppositely charged ions. Ionic bonding usually occurs between atoms of metals and atoms of nonmetals. Energy is needed to remove electrons from metal atoms. Energy is released when most nonmetal atoms gain electrons.

16. Homework: Questions from page 317 – Number 3-9 Questions from page 317 – Number 3-9