CHEM 1122 Lecture Notes - Lecture 7: Phosphorus Pentachloride, Ammonia, Bond Length
Document Summary
Bonding theories - models that predict how atoms bond together to form molecules. Predict what combinations of atoms form compounds and what combinations do not. Explain the shapes of molecules, which in turn determine many of their physical and chemical properties. Lewis model - bonding theory, we represent electrons as dots and draw structures or. Valence electrons are those electrons in the outermost principal shell. In the lewis model, the valence electrons of main-group elements are represented as dots surrounding the symbol of the element. The result is a lewis structure or dot structure. We place the dots around the element"s symbol with a maximum of two dots per side. Atoms with 8 valence electrons - which are particularly stable - are easily identified because they have eight dots - an octet. For helium, a dut represents a stable electron configuration.
