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Metallic Bonds

Metallic Bonds. Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”. Metals. Metals consist of closely packed cations floating in a “sea of electrons”. All of the atoms are able to share the electrons. The electrons are not bound to individual atoms. Properties of Metals.

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Metallic Bonds

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  1. Metallic Bonds ChemistryMrs. Coyle

  2. Cations packed in “a sea of electrons”

  3. Metals • Metals consist of closely packed cations floating in a “sea of electrons”. • All of the atoms are able to share the electrons. • The electrons are not bound to individual atoms.

  4. Properties of Metals • Good conductors • Ductile • Malleable • Electrons act as a lubricant, allowing cations to move past each other

  5. Metals have a Crystalline Structure • Packed spheres of the same size and shape: • Body Centered Cubic • Face Centered Cubic • Hexagonal Close Packed

  6. Body Centered Cubic Chromium

  7. Face-Centered Cubic Gold

  8. Hexagonal Close-Packed Zinc http://phycomp.technion.ac.il/~pavelba/hcpS.gif

  9. Alloys • Mixtures of two or more elements, at least one of which is a metal. • Made by melting, mixing, then cooling the metals. • May contain non-metals like carbon.

  10. Alloys • Properties are superior to their components. • Sterling silver • 92.5% Ag, 7.5% Cu • Harder than silver • Bronze • 7:1 Cu to Sn (tin)

  11. Alloys • Stainless Steel • Fe 80.6%, Cr 18%, C 0.4%, Ni 1% • Cast Iron-Fe 96%, C 4%

  12. Types of Alloys • Two types of formation: • Substitutional alloys • Similar size atoms – replacement • Interstitial alloys • Different size atoms – smaller ions fill interstices (spaces between atoms)

  13. Why is a metal ductile but an ionic compound is not?

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