Click a Show Trend button for Atomic Radius, Ionization Energy, Electron Affinity, Electronegativity, or Effective Nuclear Charge.
Observe the color-coded periodic table; deep blue indicates low values, white mid-range, and deep red high values.
Hover over any element to view a tooltip with the exact property value (with units) and element information.
Watch colors smoothly transition when switching to a different property to reinforce trend direction.
Use the arrows in the upper-right text box to connect color patterns to general periodic trends.
Classroom Ideas
Trend Prediction: Hide the annotations and ask learners to predict which direction the property increases; then verify with the arrow text box.
Exception Hunt: Assign students to find and explain anomalies (e.g., oxygen’s electron affinity versus sulfur).
Compare Trends: Toggle between two properties and discuss how Coulombic attraction explains both patterns.
Educational Context
Subject: AP Chemistry — Periodic Trends
Grade Level: 11–12
Learning Objectives:
Apply knowledge of effective nuclear charge and shielding to interpret periodic trend data.
Analyze differences between groups/periods and evaluate notable exceptions.
Duration: 10–15 minutes of guided inquiry or independent practice.
Prerequisites: Atomic structure, electron configurations, Coulombic attraction.
Assessment Ideas: Quick-write explaining why atomic radius decreases across a period; screenshot an element and describe its position relative to the trend.