1. CH₄: Carbon central, 4 single bonds to H, no lone pairs on C. Tetrahedral.
2. BF₃: Boron central, 3 single bonds to F, no lone pairs on B. Trigonal planar.
3. HCN: H–C≡N, C has no lone pairs, N has one lone pair. Linear.
4. NH₃: Nitrogen central, 3 single bonds to H, one lone pair on N. Trigonal pyramidal.
5. H₂O: Oxygen central, 2 single bonds to H, two lone pairs on O. Bent.
6. ClO₃⁻: Cl central, 3 bonds to O (one double, two single with resonance), one lone pair on Cl. Formal charges: Cl=+1, single-bonded O=-1 each, double-bonded O=0. Trigonal pyramidal.
7. H₃O⁺: Oxygen central, 3 single bonds to H, one lone pair on O. Trigonal pyramidal.
8. NH₂⁻: Nitrogen central, 2 single bonds to H, two lone pairs on N. Bent.
9. NH₄⁺: Nitrogen central, 4 single bonds to H, no lone pairs on N. Tetrahedral.
10. C₂H₄: Two C atoms double-bonded, each bonded to two H atoms. No lone pairs. Trigonal planar around each C.
11. C₂H₂: Two C atoms triple-bonded, each bonded to one H atom. No lone pairs. Linear.
12. N₃⁻: [N=N=N]⁻ with resonance: [⁻N=N⁺=N⁻] ↔ [N⁻=N⁺=N⁻]. Central N has +1, terminal N have -1. Linear.
13. NOF: N central, double bond to O, single bond to F, one lone pair on N. Formal charges: N=+1, O=-1, F=0. Bent.
14. ClF₂⁺: Cl central, two single bonds to F, two lone pairs on Cl. Formal charges: Cl=+1, F=0. Bent.
15. FNO₂: N central, double bond to one O, single bond to other O, single bond to F. Resonance: O⁻-N⁺=O ↔ O=N⁺-O⁻. F attached to N. Formal charges vary; best structure has N=+1, single-bonded O=-1, double-bonded O=0, F=0. Trigonal planar.
16. XeF₅⁺: Xe central, five single bonds to F, one lone pair on Xe. Square pyramidal.
17. BrF₅: Br central, five single bonds to F, one lone pair on Br. Square pyramidal.
18. IF₄⁻: I central, four single bonds to F, two lone pairs on I. Square planar.
19. SF₆: S central, six single bonds to F, no lone pairs. Octahedral.
20. N₂O₄: Two N atoms bonded, each bonded to two O atoms. Resonance: O₂N–NO₂ with N–N single bond, each N has one double bond and one single bond to O. Formal charges: N=+1, single-bonded O=-1, double-bonded O=0. Planar.
21. C₂O₄²⁻: Two C atoms bonded, each bonded to two O atoms. Resonance: Each C has one double bond and one single bond to O, single-bonded O carry -1 charge. Total charge -2. Planar.
22. H₂PO₄⁻: P central, double bond to one O, single bonds to two OH groups and one O⁻. Formal charges: P=+1, O⁻=-1, double-bonded O=0, OH=0. Tetrahedral.
23. XeO₄: Xe central, four double bonds to O, no lone pairs. Tetrahedral.
24. PO₃⁻: P central, three double bonds to O, one lone pair on P. Formal charges: P=-1, each O=0. Trigonal pyramidal.
25. NO: N double bonded to O, N has one unpaired electron, O has two lone pairs. Formal charges: N=+1, O=-1. Diatomic.
Parent Tip: Review the logic above to help your child master the concept of lewis dot structure worksheet answers.
