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DO NOW . Objective: Relate the properties of metals to their structure . List some properties of metals. . The Structure of Metals. Metallic Bonds Metal atoms achieve stable electron configuration by losing electrons In a metal, electrons are free to move among the atoms

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DO NOW

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  1. DO NOW Objective: Relate the properties of metals to their structure List some properties of metals.

  2. The Structure of Metals • Metallic Bonds • Metal atoms achieve stable electron configuration by losing electrons • In a metal, electrons are free to move among the atoms • The metal is basically a cation surrounded by free electrons • A metallic bond is the attraction between a metal cation and the shared electrons that surround it.

  3. Metallic Bonds The cation in a metal form a lattice that is held in place by strong metallic bonds between the cations and the surrounding valence electrons Overall the metal is neutral because the electrons are moving around, but not leaving. The more valence electrons a metal gives to the pool, the stronger the metallic bond is.

  4. Explaining Properties of Metals • The structure within a metal affects the properties of metals. • The mobility of electrons within a metal lattice explains some of the properties of metals • Two major properties • Ability to conduct and electrical current • Free flow of shared electrons • Maleability • Lattice is flexible

  5. Alloys The purity of a metal alloy is expressed in karats An alloy is a mixture of two or more elements, at least one of which is metal. Alloys have the properties of metals Scientists can design alloys with specific properties by varying the types and amounts of elements in an alloy

  6. Alloys • Copper Alloys • Bronze • Brass • Steel Alloys • Steel is an alloy from Iron and Carbon • The properties of steel depend on the other elements added • Other alloys • Airplane parts

  7. Recap Objective: relate the properties of metals to their structure How are the properties of metals and alloys related to their structure and composition?

  8. Homework Page 181 questions 1-8

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