What is a covalent bond what is an unshared pair - make a

Question

1. What is a covalent bond? What is an unshared pair (nonbonding pair or lone pair)?

2. Make a list of rules for writing Lewis Structures.

3. What does VSEPR stand for? What is VSEPR used to do? What is the principle behind the VSEPR theory?

4. Draw the correct Lewis structures and molecular geometries for H₂O, NH₃, BrF₃ and PC11F³. Name each molecular geometry.