07.3+Metallic+Bonding

=Objectives= 1.How can you model the valence electrons of metal atoms? 2. How are metal atoms arranged? 3. Why are alloys important?

7.1 Ions
 * How do you dind the number of valence electrons in an atom of a representative element?
 * Atoms of whcih elements tend to gain electrons? Atoms of whcih elements tend to lose electrons?

7.2 Ionic Bonds And Ionic Compounds
 * What is the electrical charge of an ionic compound?
 * What are three properties of ionic compounds?

7.3 Bonding in Metals
 * How can you model the valence electrons of metal atoms?
 * How are metal atoms arranged?
 * Why are alloys important?

=Outlined Notes=

1. The valence electrons of metal atoms can be modeledas a sea of electrons. 2. __Metallic bonds__ - consists of the attraction of the free-floating valence electrons for the positivly charged metal ions. 1. Metal atoms are arranged in very compact and orderly patterns. 2. Three arrangements: body-centered cubic, face-centered cubic, and exagonal close packed arrangements. 1. __Alloys__- mixtures composed of two or more elements, at leat one one of which is a metal. 2. Alloys are important because their properties are often superior to those of their component elements. 3. Most important alloys today are steels.
 * A. Metallic Bonds and Metallic Properties**
 * B. Crystalline Structure of Metals**
 * C. Alloys**

=Reference Pages=



Hexagonal Closed-packed
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Face-centered cubic
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Body-centered cubic
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=Practice Problems=
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=Assignments=

=Labs= http://www.mvhs.fuhsd.org/mia_onodera/chemistry%20documents/labs%202006-2007/lab%208-%20Shapes%20of%20Crystalline%20Materials%20Lab%20rubric%20&%20problems%20modified.doc

=Sample Test= [] [] log in as a guest [] [] http://quizlet.com/682381/chemistry-metallic-bonding-flash-cards/ []
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= = =**Links**=

[] [] []http://encyclopedia.farlex.com/Metallic+bonds http://dl.clackamas.cc.or.us/ch104-08/metallic.htm [] [] [] http://home.comcast.net/~christylthomas/addnotes15.pdf [] __http://www.chemcool.com/regents/chemicalbonding/aim5.htm__