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Presentation transcript:

We are starting a new unit Read the following slides and make a set of notes. Title today’s notes: Lesson 1 Valance Electrons

Chemical Bonds & Reactions - + + -

Chemical Bond A force of attraction that holds two atoms together Has a significant effect on chemical and physical properties of compounds involves the valence electrons Valence Electrons – the electrons in the outermost energy level of an atom This Lithium Atom has one valence electron

Counting Valence Electrons Carbon 4 valence electrons Beryllium 2 valence electrons Oxygen 6 valence electrons

Determining the Number of Valence Electrons by Using the Periodic Table *Atoms of elements have the same number of valence electrons as their group number number in the periodic table. Group 1 elements (the alkali metals) have 1 valance electron and group 8 elements (noble gases) have 8 valance electrons

How Many Valence Electrons? Hydrogen Lead Xenon Sulfur Rubidium 1 Valence Electron 4 Valence Electrons 8 Valence Electrons 6 Valence Electrons 1 Valence Electron

Valance electron practice You are finished with your notes. Now go back to the class website and click on the link titled: Assignment 1 Valance electron practice and complete the assignment in your notebook.