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  1. Periodic Table - Ptable

  2. Periodic Table of Elements - PubChem

  3. Periodic TableRoyal Society of Chemistry

  4. Periodic table - Wikipedia

  5. Interactive Periodic Table of the Elements

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

  7. Periodic Table of Elements - American Chemical Society

  8. Periodic Table - Interactive Chemical Element Reference Tool

  9. Periodic Table of Elements - BYJU'S

  10. Interactive Periodic Table | Complete Chemistry Reference Tool