Valence Electrons Def: the electrons in an atom’s outermost orbitals (usually the highest principal energy level) Write the noble-gas configurations for:

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Presentation transcript:

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 are the valence electrons!!!

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.

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.

Group Practice & Self-Check Assignment: P.141: 25, 26, 28 P.147: 81-82 Workbook Assignment: pp.29-30