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  1. Groups of the periodic table - Chemistry Stack Exchange

  2. terminology - Periodic table groups - which grouping is "right ...

  3. Why do some periodic tables have 18 groups while others have 8?

  4. Are periods the horizontal numbers on the periodic table and …

  5. Why are there 3 columns in Group VIII of the Periodic Table?

  6. On the periodic table: Why are groups of elements organized by …

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  8. Why are there two Hydrogen atoms on some periodic tables?

  9. Why is the periodic table in groups? - Answers

  10. Diagonal line going through groups IIIA-VIA on the periodic table