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

  6. Periodic Table of Elements - American Chemical Society

  7. Periodic Table of Elements - BYJU'S

  8. Periodic Table of Elements - IUPAC | International Union of Pure …

  9. Interactive Periodic Table - ChemTalk

  10. Periodic Table - Periodic Table