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  1. Periodic Table - Ptable

  2. Periodic table - Wikipedia

  3. Periodic Table of Elements - PubChem

  4. Periodic Table of Elements - Chemazone

  5. Periodic TableRoyal Society of Chemistry

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

  7. Interactive Periodic Table of the Elements | Symbols, Atomic …

  8. The periodic table of the elements by WebElements

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

  10. Interactive Periodic Table of Elements | Fisher Scientific