2. Formal Charges The following Lewis structures all have the same chemical formula: HCNO. However, lone pairs and formal charges are missing. Complete these structures with lone pairs and label formal charges where appropriate. Note that the octet rule may not apply in some cases. Hint: Start by calculating the total number of valence electrons. H b-CEN H-CEN-O B H b-N=C . b-N=C C D H N H-026 _o E F 1. Which structures have no formally charged atoms? 2. Which formulas have a nitrogen with a formal charge? 3. Which formulas have a nitrogen with a formal charge? 4. Which structures have an oxygen with a formal charge? 5. Which structures have an oxygen with a formal charge? 6. Which structures have a carbon with a formal charge? 7. Which structures have a carbon with a formal charge? 8. Which formulas have an electron deficient C, N, or 0