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

  2. Element Families of the Periodic Table - ThoughtCo

  3. Element Families on the Periodic Table - Science Notes and …

  4. 2.3: Families and Periods of the Periodic Table

  5. 10.5.2: Families of the Periodic Table - Chemistry LibreTexts

  6. Periodic table - Elements, Groups, Blocks | Britannica

  7. Periodic table | Definition, Elements, Groups, Charges, Trends,

  8. Properties of Periodic Table of Element Groups - ThoughtCo

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

  10. Periodic Table of Elements - PubChem