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Bonding Review

Conceptual Questions

#1. Why do atoms bond?


#2. What does it mean to have a high bond polarity?


#3. In a bond between a highly electronegative atom and a less electronegative atom, which atom will the electrons in the bond be closer to?


#4. Describe the relationship between bond length and bond strength.


#5. Categorize the following as intermolecular or intramolecular forces: polar bonds, ionic bonds, Van der Waals interactions, metallic bonds, and hydrogen bonds.


#6. Why are elements after `P` able to expand their octet? For which elements is the octet rule strictly followed?


#7. What 2 factors determine the molecular geometry of a molecule?


#8. What is the difference between molecular geometry and electron geometry?


#9. If a bond has a higher bond order than another bond, what can you say about their relative lengths? Why?


#10. What is the significance of polyatomic ions?



Conceptual Answers

#1. Atoms bond for two main reasons. First, atoms bond in order to satisfy valency. This explains why elements with satisfied octets do not react: they have no reason to. Second, atoms bond to achieve a more stable state. By creating a bond, the atoms involved in bonding release energy.


#2. A high bond polarity indicates that the atoms involved in bonding have a large difference in electronegativity.


#3. The electrons will be drawn more towards the electronegative atom because, by definition, electronegative atoms desire electrons more strongly than less electronegative atoms do.


#4. The stronger the bond, the shorter it is. The two have an inverse relationship where, as one increases, the other decreases.


#5. Intermolecular: Van der Waals interactions, Hydrogen Bonds, and Metallic Bonds. Intramolecular: Polar bonds and Ionic Bonds,


#6. Elements after `P` have access to the d-orbitals and thus are able to contain more electrons. The only elements that strictly follow the octet rule are atoms 6-14.


#7. Number of bonds and number of lone pairs


#8. For molecular geometry, bonds and lone pairs are distinct. For electron geometry, both are counted as the same.


#9. The higher the bond order, the stronger the bond. Thus, the bond with the higher bond order will have a shorter length relative to the other bond.


#10. Polyatomic ions are ions composed of multiple atoms that are very likely to stay in that molecular form. Whenever you see a polyatomic ion, you can treat it as a single atom.