Final Exam Review

Review 2

Copy down and answer the following questions. You may use your book or notebook if necessary.

1. What are valence electrons?2. Why are valence electrons important?3. How many valence electrons do atoms want

in their outer energy level?4. Write dot diagrams for the following

elements:Sodium, oxygen , neon, chlorine

Answers:

1. Valence electrons are the electrons found in the outer energy level of an atom.

2. They are important because they determine how reactive an element is.

3. Most atoms want 8. Hydrogen and Helium only need 2 valence electrons.

4. Na O Ne Cl