Bonding
How atoms connect: VSEPR shapes, hybridization, electron orbitals, and sigma vs. pi bonds.
- Content level: CoreExpected foundation for a general high school chemistry audience.
- Content level: ChallengeEnrichment or more demanding reasoning within high school chemistry.
Content level is separate from question difficulty.
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Not assessed → Developing → Proficient → Mastered. Proficient requires 5 of the latest 6 different independent questions correct, plus independent success on 2 medium or hard questions. Mastered adds 2 new correct answers in mixed practice at least 24 hours later. Hints and retries remain useful practice, but do not establish proficiency. Review reminders do not lower a level.
Hybridization
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Practice this topicElectron orbitals
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Practice this topicSigma and Pi bonds
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Practice this topicVSEPR
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Full lessons
Complete lessons with objectives, worked examples, quick checks, and linked practice.
- Orbitals, Subshells and Quantum NumbersElectron orbitals · 18 min
- Filling Orbitals: Aufbau, Pauli and HundElectron orbitals · 18 min
- Counting Electron DomainsVSEPR · 20 min
- VSEPR Shapes and Bond AnglesVSEPR · 20 min
- Hybrid Orbitals from Domain CountHybridization · 16 min
- Hybridization, Geometry and Bond Angles TogetherHybridization · 20 min
- Sigma and Pi BondsSigma and Pi bonds · 16 min
- Bond Order, Length, Strength and RotationSigma and Pi bonds · 18 min
Lessons
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