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  1. Periodic Table Groups vs. Periods | Properties & History

  2. Periodic Table Groups vs. Periods | Properties & History - Study.com

  3. Electronegativity | Definition, Periodic Trend & Example

  4. How to Predict Properties of Elements using Groups & Periods

  5. Video: Periodic Table Groups vs. Periods | Properties & History

  6. Ionization Energy | Definition, Trends & Factors - Lesson - Study.com

  7. Valence Electrons | Definition, Role & Examples - Lesson - Study.com

  8. Atomic & Ionic Radius Trend | Definition, Differences & Chart

  9. Periods, or horizontal rows, are arranged so that elements with …

  10. What are the periods of the periodic table? - Homework.Study.com