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  1. Periodic Table: Periods, Groups, and Families - Chemistry Learner

  2. Periodic table Groups Explained !! (With 1-18 Group Names)

  3. Periodic Table Groups and Periods Recently updated - Science …

  4. Group (periodic table) - Wikipedia

  5. How to Read the Periodic Table | Groups & Periods - ChemTalk

  6. 2.3: Families and Periods of the Periodic Table

  7. 4.8: Electron Configurations and the Periodic Table

  8. 2.2: The Periodic Table - Chemistry LibreTexts

  9. How the Periodic Table groups the elements | Live Science

  10. Groups of elements in the periodic table - Oak National Academy