Metallic Bonding Chemical Bonding. Tuesday, October 30 Create new notes page, titled “Metallic Bonds” Take out your homework from last night- Lewis dot.

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Presentation transcript:

Metallic Bonding Chemical Bonding

Tuesday, October 30 Create new notes page, titled “Metallic Bonds” Take out your homework from last night- Lewis dot packet Don’t forget to bring: White marshmallows Small colored marshmallows Red hots gumdrops

Wednesday, October 31 Take out clean sheet of notebook paper, title “Lewis Structure Quiz” Take out your homework from last night- Lewis dot packet Don’t forget to bring: White marshmallows Small colored marshmallows Red hots gumdrops

Lewis Structures Quiz Complete a Lewis Structure for the following compounds: 1. N 2 H 2 2. H 2 CO 3. NH 3 4. (PO 4 ) ³ˉ 5. HCN 6. How many lone pair of electrons does N 2 H 2 have? 7. How many lone pair of electrons does NH 3 have? 8. What three elements can form double/triple bonds? 9. What bond forms between metals and nonmetals? 10. What bond could form between two elements in Group 17?

Metallic Bonding Chemical bonding is different in metals than it is in ionic, molecular, or covalent-network compounds The unique characteristics of metallic bonding gives metals their characteristic properties electrical conductivity thermal conductivity Malleability Ductility shiny appearance

Metallic Bonding The Metallic-Bond Model In a metal, the vacant orbitals in the atoms’ outer energy levels overlap This overlapping of orbitals allows the outer electrons of the atoms to roam freely throughout the entire metal The electrons are delocalized, which means that they do not belong to any one atom but move freely about the metal’s network of empty atomic orbitals These mobile electrons form a sea of electrons around the metal atoms

Metallic Bonding The Metallic-Bond Model The chemical bonding that results from the attraction between metal atoms and the surrounding sea of electrons is called metallic bonding

Metallic Bonding The Metallic-Bond Model

Metallic Bonding Properties of Metals: Surface Appearance Re-radiated light (reflection) when electrons fall back to ground state Give metallic/shiny appearance

Metallic Bonding Properties of Metals: Malleability and Ductility Malleability: ability to hammer down or beat into thin sheets Ductile: ability to draw or pull substance to produce a wire

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