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  1. Periodic Table - Ptable

  2. List of Metals - Science Notes and Projects

  3. Periodic Table of Elements - PubChem

  4. Metals, Metalloids, and Nonmetals - Element Classification Groups

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

  6. Periodic table - Wikipedia

  7. Periodic table - Elements, Groups, Blocks | Britannica

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

  9. Periodic TableRoyal Society of Chemistry

  10. Periodic Table of Elements - American Chemical Society