In the first part of this lecture, we define the concepts of ionization energy, electron affinity and electronegativity. We then describe how ionic bonds are formed between atoms with large differences in electronegativity. Finally, we describe covalent bonds which form between atoms of similar or equal values of electronegativity.
In the second part of this lecture we describe a molecule as a mathematical entity called a graph. We show that a graph consists of two tables, the x,y,z coordinate table for each atom, and the connectivity table which describes which atoms are connected by chemical bonds. Using the graph concept, we can draw a 3-D representation of a molecule on a spreadsheet.
To prepare for this lecture, we suggest that you read sections 3-1 through 3-3 of Oxtoby.
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