MATLS 1M03 Chapter Notes - Chapter 2: Electronvolt, Jmol, Gallium

• School: McMaster University
• Department: Materials Science and Engineering
• Course: MATLS 1M03
• Professor: Hatem Zurob

Document Summary

2: at interactions between atoms are negligible, as the atoms approach each other, they start to interact (cid:4666)ie. exert forces on one another(cid:4667): Attractive force, fa ; repulsive force, fr. Magnitude of force is a function of interatomic distance. The bond length corresponds to the distance at which the attractive and repulsive forces exactly balance. Minimum energy is called the bond energy, e0(cid:4666)energy that is required to completely separate two atoms(cid:4667) Ionic bond: when the difference in electronegativity is large, one element loses electrons and the other gains electrons. Covalent bond: stable electron configuration is achieved by sharing/ overlap of outer orbitals, strong bond, si bond energy 450 kj/mol, c bond energy 713 kj/mol. Ion cores in a sea of electrons : electrons are free to drift, excellent conductors of electricity and heat, electrons act to glue the ion cores together, al bond energy 324 kj/mol, fe bond energy 406 kj/mol.