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  1. Periodic Table - Ptable

  2. Free Printable Periodic Tables (PDF and PNG)

  3. Periodic Table With Everything - Science Notes and Projects

  4. Periodic Table of Elements - American Chemical Society

  5. Periodic TableRoyal Society of Chemistry

  6. List of chemical elements - Periodic Table

  7. Periodic table - University of Pennsylvania

  8. Periodic Table Trends Cheat Sheet (pdf) - CliffsNotes