Chapter 7 Ionic and Metallic Bonding

Chapter 7 Ionic and Metallic Bonding - Chapter 7 Ionic and...

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Unformatted text preview: Chapter 7 Ionic and Metallic Bonding Pre-AP Chemistry Charles Page High School Stephen L. Cotton Section 7.1 - Ions OBJECTIVES: Determine the number of valence electrons in an atom of a representative element. Section 7.1 - Ions OBJECTIVES: Explain how the octet rule applies to atoms of metallic and nonmetallic elements. Section 7.1 - Ions OBJECTIVES: Describe how cations form. Section 7.1 - Ions OBJECTIVES: Explain how anions form. Valence Electrons are? The electrons responsible for the chemical properties of atoms, and are those in the outer energy level. Valence electrons- The s and p electrons in the outer energy level the highest occupied energy level Core electrons are those in the energy levels below. Keeping Track of Electrons Atoms in the same column. .. 1) Have the same outer electron configuration. 2) Have the same valence electrons. The number of valence electrons are easily determined. It is the group number for a representative element Group 2A: Be, Mg, Ca, etc. have 2 valence electrons Electron Dot diagrams are A way of showing & keeping track of valence electrons. How to write them? Write the symbol - it represents the nucleus and inner (core) electrons Put one dot for each valence electron ( 8 maximum ) They dont pair up until they have to (Hunds rule) X The Electron Dot diagram for Nitrogen Nitrogen has 5 valence electrons to show. First we write the symbol. N Then add 1 electron at a time to each side. Now they are forced to pair up. We have now written the electron dot diagram for Nitrogen. The Octet Rule In Chapter 6, we learned that noble gases are unreactive in chemical reactions In 1916, Gilbert Lewis used this fact to explain why atoms form certain kinds of ions and molecules The Octet Rule : in forming compounds, atoms tend to achieve a noble gas configuration; 8 in the outer level is stable Each noble gas (except He, which has 2) has 8 electrons in the outer level Formation of Cations Metals lose electrons to attain a noble gas configuration....
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Chapter 7 Ionic and Metallic Bonding - Chapter 7 Ionic and...

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