📚 Key Concepts
Modern Periodic Law: Properties are periodic function of atomic numbers, p, d, f blocks based on valence electron configurationPeriod: Same n value (horizontal rows)Group: Same outer electronic configuration (vertical columns)Mendeleev vs Modern classification differences
🎯 Key Formulas
Atomic radius: ↓ group, → periodIonization energy: ↑ group, ← periodElectron affinity: ↑ group, ← periodElectronegativity: ↑ group, ← periodMetallic character: ↓ group, → period
⚠️ Common Mistakes to Avoid
Confusing group and period trendsWrong electronic configurations for exceptionsMixing atomic and ionic radii trendsIncorrect prediction of element properties
📖 Knowledge Prerequisites
Electronic configurationQuantum numbersTypes of bondingBasic periodic table layout
💡 Tips for Students
Learn trends with reasoning, not just directionRemember diagonal relationshipsFocus on exceptions to trendsConnect electronic structure to properties
👉 Practice Recommedations
Predict properties based on positionCompare elements' propertiesWrite electronic configurationsExplain trend variationsIdentify elements from properties
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