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

  2. Electronegativity | Definition, Periodic Trend & Example

  3. Answered: What is a period in the periodic table?… | bartleby

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

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

  6. How to Write the Electron Configuration for Elements in the 3rd …

  7. Which period of the periodic table has 32 elements?

  8. Periodic Table Metals | Definition, Reactivity & Examples

  9. Group 4A Elements Overview & Properties - Study.com

  10. How many elements are in the first period of the periodic table?