Metallic Bonding 7.3 - PowerPoint PPT Presentation

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Metallic Bonding 7.3

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  1. Metallic Bonding 7.3

  2. Electron Sea Model The electron sea model proposes that all the metal atoms in a metallic solid contribute their valence electrons to form a “sea” of electrons. This sea of electrons surrounds the metal cations.

  3. Electron Sea Model Diagram

  4. Properties of Metallic Bonds • The electrons can move easily from one atom to the next. • Because they are free to move, they are often referred to as delocalized electrons. • A metallic bond is the attraction of a metallic cation for delocalized electrons.

  5. Metals have high melting points & boiling points • Metals are malleable which means they can be hammered into sheets & they are ductile which means they can be drawn into wires • The delocalized electrons cause heat to be conducted better in metals Properties of Metals

  6. Alloys are mixtures composed of two or more elements • of which one must be a metal. • Alloys are important because their properties are often • superior to those of their component elements. Alloys

  7. Page 285 Problems 1-15 Classwork