1. Shell Filling
January 18, 2019
GSCI 163 Spring 2010

2. Bonding
Ionic Bonds
Core charge assumes that non valence electrons shield part of the nuclear charge. Our model neglects inner electrons because they don’t contribute to the chemistry
Consider two atoms, one Na and on Cl.
Neutral Na has a positive core and 1 valence electron.
Neutral Cl has 7+ core with 7 valence electrons.
These features are illustrated on the left using the Lewis dot structure.
Moving one electron complete from Na to Cl leaves two ions.
Na+ Cation Cl- Anion
The ideal ionic bond has on atom incorporating the electron completely into its structure thereby creating two ions. The atoms are held together as a molecule by the attraction of the charge (+ to -).
January 18, 2019
GSCI 163 Spring 2010

3. Covalent Bonds
Core charge assumes that non valence electrons shield part of the nuclear charge. Our model neglects inner electrons because they don’t contribute to the chemistry
Consider two identicla atoms, Cl.
Neutral Cl has 7+ core with 7 valence electrons.
These features are illustrated on the left using the Lewis dot structure.
Sharing an electrons, one from each atom fills the shells.
January 18, 2019
GSCI 163 Spring 2010

4. Metallic Bonds Metal atoms form a lattice
Different crystal structures possible.
Electrons can be thought of as a gas bound to the lattice and not any individual atom.
January 18, 2019
GSCI 163 Spring 2010

5. http://www.explorelearning.com User | Password As752 | sea959
As845 | arm139
As159 | wind596
As841 | wind557
As387 | egg731
As253 | bag343
As642 | sun933
As155 | pen443
Worksheet on phystu
Phystu\Courses\GSCI163_giovanettiSP10\GizActW3.doc
January 18, 2019
GSCI 163 Spring 2010

6. material Electron configuration Bonding
Ionic
Covalent
Metallic
Hydrogen (next)
Apply Lewis diagram to get chemical formulas (at least a good guess- some formulas are exceptions to rules)
January 18, 2019
GSCI 163 Spring 2010