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CSCA ChemistryChapter 3: Chemical Theories and LawsBeginner

Atomic Structure & Periodic Law Trends

原子结构模型与元素周期律递变规律 · Node 3.1

Nuclear structure (protons, neutrons, electrons), effective nuclear charge, atomic radius, and ionization energy trends.

Chapter Weight: 25% of official examination
Practice This Node

Core Mathematical Axiom

Formula Proof & Traps
Zeff​=Z−S,ratomic​↘(across period),I1​↗(across period)
CSCA Exam Trap Alert

Overlooking half-filled 2p^3 stability in Nitrogen (which gives it higher 1st ionization energy than Oxygen).

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