Unit 04Content level: Core
Molecular Structure
Lewis structures, the octet rule, and formal charge for building and evaluating molecules.
Formal ChargeLewis structuresOctet rule
Practice this unit66 active questions
What the labels mean
- Content level: CoreExpected foundation for a general high school chemistry audience.
- Content level: ChallengeEnrichment or more demanding reasoning within high school chemistry.
- Content level: Olympiad/CollegeMaterial that reaches toward chemistry olympiads, college prep, or early university courses.
Content level is separate from question difficulty.
Lessons
8
Practice questions
66
Difficulty
Easy · Medium · Hard
Full lessons
Complete lessons with objectives, worked examples, quick checks, and linked practice.
- Valence Electrons and the Octet RuleOctet rule · 18 min
- Exceptions to the Octet RuleOctet rule · 20 min
- Drawing Lewis Structures Step by StepLewis structures · 22 min
- Multiple Bonds and Polyatomic IonsLewis structures · 20 min
- Resonance StructuresLewis structures · 20 min
- Formal Charge: Definition and CalculationFormal Charge · 20 min
- Choosing the Best Lewis Structure with Formal ChargeFormal Charge · 22 min
- Expanded Octets and Formal Charge Trade-offsFormal Charge · 22 min
Lessons
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