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Element Families of the Periodic Table - ThoughtCo
Element Families on the Periodic Table - Science Notes and …
Periodic Table - Ptable
Periodic Table of Elements - PubChem
Periodic Table: Periods, Groups, and Families - Chemistry Learner
2.3: Families and Periods of the Periodic Table
How to Read the Periodic Table | Groups & Periods - ChemTalk
Periodic Table – Royal Society of Chemistry
10.5.2: Families of the Periodic Table - Chemistry LibreTexts
Periodic Table of Element Groups - ThoughtCo