Periodic Trends
Patterns across the periodic table, how atomic structure explains size, ionization energy, and shielding.
- 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.
Topic mastery
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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.
Electronegativity ionization energy atomic radius
Not assessedAnswer practice questions to assess this topic.
Practice this topicShielding/Electron Orbital structure
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Full lessons
Complete lessons with objectives, worked examples, quick checks, and linked practice.
- Electron Configurations and Orbital FillingElectron configuration · 25 min
- Orbital Diagrams, Hund's Rule and MagnetismOrbital diagrams · 20 min
- Electron Configurations of IonsIon configurations · 20 min
- Shielding and Effective Nuclear ChargeEffective nuclear charge · 20 min
- Atomic Radius, Ionization Energy and ElectronegativityCore periodic trends · 25 min
- Ionic Radius and Isoelectronic SeriesIonic radius · 20 min
- Trend Anomalies and Successive Ionization EnergiesAnomalies and successive IE · 25 min
- Photoelectron Spectroscopy (PES)Photoelectron spectroscopy · 25 min
Lessons
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