CHM 2353 Lecture Notes - Lecture 5: Solid Solution, Metal, Intermetallic

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 2353
• Professor: Muralee Murugesu

Document Summary

Bonding model for metals must account for malleability, ductility, thermal conductivity, electrical conductivity, durability, high melting point. Valence electrons can move throughout the metal structure in molecular orbits formed from atomic orbitals - responsible for electrical conductivity. When two atoms approach each other, their atomic orbitals overlap. The electrons ll the molecular orbitals from lowest energy to highest energy, regardless of which atom it belongs to. Combination of n atomic orbitals forms n valence molecular orbitals, where n/2 orbitals are bonding and n/2 are antibonding. If n is large enough, molecular orbitals will be so close in energy that they will form a band, or a continuum. ***nb: this does not work for individual atoms or for gas phase atoms - no orbital mixing. Destroying a metal array doesn"t break one bond, it cancels the cohesion between all metal atoms. The mos are represented as a band.