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Metallic Bonding

Metallic Bonding. Objective. Objective: describe how metallic bonds form and how this is related to the properties of metals. Metals. Metals are composed of closely packed cations where valence e - drift and float between cations. Metals.

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Metallic Bonding

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  1. Metallic Bonding

  2. Objective • Objective: describe how metallic bonds form and how this is related to the properties of metals

  3. Metals • Metals are composed of closely packed cations where valence e- drift and float between cations

  4. Metals • Metallic bond: created by attraction of free floating e- to positive metal cations • “sea of e-” float freely between cations

  5. Properties of Metals • Good conductors of electricity: due to e- able to move freely • Ductile: can be drawn into wire, • e- can move in any direction so they fill in gaps between cations • Malleable: can be flattened into a sheet • Free e- allow metals to be easily shaped

  6. Alloys • Most metals we use are alloys • Alloy: mixture of 2 or more elements where at least 1 element is a metal • Alloys typically have more useful properties than pure metals • Example: stronger, resistance to rusting and corrosion

  7. Common Alloys Brass • Brass: made of copper and zinc • Sterling silver: 92.5% silver, 7.5% copper Sterling Silver

  8. Common Alloys Bronze • Bronze: 7 parts copper, 1 part tin • Steel: most important alloy • Fe can be mixed with C, B, Cr, Mn, Mo, Ni, W, V depending on the type of steel Steel

  9. Ticket Out the Door – Review Questions • 1) Explain in 2-3 sentences how the “sea of electrons” helps hold a metallic bond together. • 2) Explain in 2-3 sentences how the sea of electrons allows a metal to be malleable and ductile

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