Unit 3: Bonding
Bonds are connections between atoms. (Note that although we will focus on bonds in this unit, there are additional forces that affect atoms, i.e., intermolecular forces.) A solid grasp of VSEPR (Valence Shell Electron Pair Repulsion) theory will help us understand how elements that differ by one or two atomic numbers behave similarly or differently. VSEPR theory explains that the number of electrons an element possesses is intimately tied to its chemical properties. For example, though sodium differs from both neon and potassium by just one atomic number, it is extremely different from neon but very similar to potassium. This is because neon is a stable element with eight valence electrons (as predicted by VSEPR theory). Sodium and potassium have one and two valence electrons, respectively, which explain why they are similar to one another but quite different from neon. VSEPR is also used to predict the 3-dimensional structure, or geometry, of molecules.
Completing this unit should take you approximately 17 hours.
Unit 3 Assessment
Please take this assessment to check your understanding of the materials presented in this unit.
Notes:
- There is no minimum required score to pass this assessment, and your score on this assessment will not factor into your overall course grade.
- This assessment is designed to prepare you for the Final Exam that will determine your course grade. Upon submission of your assessment you will be provided with the correct answers and/or other feedback meant to help in your understanding of the topics being assessed.
- You may attempt this assessment as many times as needed, whenever you would like.