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  1. Periodic Table - Ptable

  2. Periodic Table of Elements - PubChem

  3. Periodic table - Wikipedia

  4. List of chemical elements - Wikipedia

  5. Periodic TableRoyal Society of Chemistry

  6. Periodic Table Of The Elements - ChemicalAid

  7. The periodic table of the elements by WebElements

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

  9. Periodic Table of the Elements | NIST

  10. Chemical Elements.com - An Interactive Periodic Table of the Elements