Count electrons and draw all lone pairs.
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8 valence electrons; H–O–H with two oxygen lone pairs; bent. Reviewed guide
Printable-style chemistry practice
Lewis Structure Worksheet with Answers
Work each formula before opening its answer. Start with the electron budget, choose connectivity, place lone pairs and finish with formal-charge and geometry checks.
Complete carbon's octet with the best bond pattern.
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16 electrons; O=C=O; two lone pairs on each oxygen; linear. Reviewed guide
Identify the nitrogen lone pair and shape.
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8 electrons; three N–H bonds and one nitrogen lone pair; trigonal pyramidal. Reviewed guide
Decide whether the central atom reaches an octet.
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24 electrons; three B–F bonds; boron has six electrons and is an incomplete-octet exception. Reviewed guide
Adjust for charge and draw resonance contributors.
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24 electrons; three equivalent N–O positions in the resonance hybrid; trigonal planar. Reviewed guide
Place the single bond, double bond and formal charges.
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18 electrons; two contributors; central O positive and single-bonded terminal O negative in each contributor. Reviewed guide
Recognize the expanded-valence classroom model.
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40 electrons; five P–Cl bonds; trigonal bipyramidal. Reviewed guide
Use the odd electron count to place one unpaired electron.
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17 electrons; radical with resonance-related contributors; bent. Reviewed guide
Recommended checking order
- Total electrons
Include charge before drawing.
- Connectivity and bonds
Confirm the central atom and any multiple bonds.
- Lone pairs and formal charges
Use every electron once.
- Geometry
Count electron domains after the Lewis structure is complete.