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Chapter 4, Section 1 Ionic Bonds Thursday, December 3, 2009 Pages 114 -- 120.

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Presentation on theme: "Chapter 4, Section 1 Ionic Bonds Thursday, December 3, 2009 Pages 114 -- 120."— Presentation transcript:

1 Chapter 4, Section 1 Ionic Bonds Thursday, December 3, 2009 Pages

2 Objectives Explain the differences between an atom and an ion. Describe how an ionic bond forms. Identify the properties of ionic compounds.

3 Vocabulary Words Ion Ionic bond Polyatomic ion Crystal

4 Quick Review When can electrons transfer? Valence electrons Stable element Reactive element Atoms either gain or lose electrons to become more stable.

5 Ion An ion is an atom or group of atoms that has become electrically charged. When an atom loses an electron (loses negativity) it becomes a positive ion. When an atom gains an electron (gains negativity) it becomes a negative ion.

6 Ionic Bond An ionic bond is the attraction between two oppositely charged ions (like opposite poles of the magnet). In this example, the sodium ion is balanced by a chloride ion. The formula NaCl shows a 1:1 ratio.

7 Polyatomic Ions Polyatomic Ions are ions made of more than one atom. It is a group of atoms that act as one.

8 Properties of Ionic Compounds The characteristic properties of ionic compounds include: crystal shape high melting points electrical conductivity

9 Homework Workbook 4.1 (due 12/8) Vocabulary quiz 4.1 (12/8)


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