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Periodic Table: Periods, Groups, and Families - Chemistry Learner
Element Families of the Periodic Table - ThoughtCo
Element Families on the Periodic Table - Science Notes and …
2.3: Families and Periods of the Periodic Table
10.5.2: Families of the Periodic Table - Chemistry LibreTexts
Periodic table - Elements, Groups, Blocks | Britannica
Periodic table | Definition, Elements, Groups, Charges, Trends,
Properties of Periodic Table of Element Groups - ThoughtCo
How the Periodic Table groups the elements | Live Science
Periodic Table of Elements - PubChem