1. Valence Electrons
Def: the electrons in an atom’s outermost orbitals (usually the highest principal energy level)
Write the noble-gas configurations for:
Sulfur
Cesium
Francium
The “leftover” electrons IN THE HIGHEST PRINCIPAL ENERGY LEVEL are the valence electrons!!!

2. Valence Electrons (cont.)
Valence electrons are important in the formation of chemical bonds between atoms.
They are represented visually by using electron-dot diagrams.
Table 5-5, p.140
Examples on the board.

3. Valence Electrons (cont.)
IMPORTANT NOTE: Dots may be placed in any order, on all four sides of the element symbol, then paired up until all are used.

4. Group Practice & Self-Check
Workbook Assignment: pp.29-30