CHEM 102 Lecture Notes - Lecture 8: Thermal Conductivity, Ductility, Electrostatics
Document Summary
Chem 102: general descriptive chemistry ii lecture 8: theories of metallic. Close packing: atoms in a crystal pack as close together as possible based on respective sizes of atoms. Alloys: alloy combination of 2 or more elements (usually metals) to make new substance, substitutional alloy 2nd element takes place of metal atom. Interstitial alloy 2nd element fills spaces in lattice between metal atoms. Molecular orbital theory model: drop off point of melting point, more electrons available = more electrons going into anti-bonding orbitals which works against having a high melting point. Lattice comprised of alternately-charged ions opposite charged atoms touch. Because ionic bonds are very strong much energy is needed to. Molecular solids break the bonds: example graphite, physical properties governed by van der waals forces, weaker than covalent-network solids; lower melting point.
