Unit 02Content level: Core
Periodic Trends
Patterns across the periodic table, how atomic structure explains size, ionization energy, and shielding.
Electronegativity ionization energy atomic radiusShielding/Electron Orbital structure
Practice this unit65 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
65
Difficulty
Easy · Medium · Hard
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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