⭐ UNIT 2 — ATOMIC STRUCTURE & ELECTRON CONFIGURATION

AP CHEMISTRY RESCUE | 2025 EDITION

🔥 The ultimate high-impact guide for mastering Unit 2 and scoring fast points on MCQs + FRQs.

🎯 

WHAT THIS GUIDE GIVES YOU

• Clear explanations of atomic models, isotopes, mass spectrometry, electron configuration, and periodicity.

• Step-by-step methods for the exact calculations AP examiners love.

• Shortcut patterns to identify trends instantly—no memorizing random facts.

• Worked examples that reflect real AP exam question styles.

• Exam traps highlighted so your students never fall for them.

• Practice sets with mixed difficulty to build confidence.

🔬 

CORE CONTENT (COLOR CODED + VISUAL)

🌈 

1. Atomic Models & Evidence

• How the photoelectric effect proves quantized energy.

• What the Bohr model gets right (and wrong).

• Why the quantum mechanical model wins.

🌈 

2. Isotopes & Mass Spectrometry

• How mass spectra reveal isotopes.

• How to calculate average atomic mass quickly.

• Real FRQ-style problems included.

🌈 

3. Electron Configuration (The Critical Skill)

• Aufbau, Hund, Pauli — explained simply.

• Shortcut configurations for ions.

• Why transition metals break the rules.

• Orbital energy diagrams with color visuals.

🌈 

4. Periodic Trends (The AP Goldmine)

Fully explained trends with reasons — not memorization:

• Atomic radius

• Ionization energy

• Electron affinity

• Effective nuclear charge

• Shielding

• Metallic vs nonmetallic character

  Includes quick comparison charts and common MCQ traps.