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  1. Element List – Element Names, Symbols, and Atomic Numbers

  2. Periodic Table of Elements - PubChem

  3. Periodic table - Wikipedia

  4. Periodic Table - Ptable

  5. 3.4: Atomic Mass and Atomic Number - Chemistry LibreTexts

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

  7. Atomic number - Wikipedia

  8. Interactive Periodic Table of the Elements | Symbols, Atomic

  9. Periodic Table of Elements - American Chemical Society

  10. Periodic Table Of The Elements - ChemicalAid