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  1. Periodic Table - Ptable

  2. The chemical elements of the periodic table sorted by symbol - Lenntech

  3. Fluorine | F (Element) - PubChem

  4. Fluorine - Wikipedia

  5. List of elements by symbol - Simple English Wikipedia, the free ...

  6. Fluorine - Element information, properties and uses | Periodic Table

  7. Element Charges Chart – How to Know the Charge of an Atom

  8. Periodic Table of Elements - PubChem

  9. Fluorine - EniG. Periodic Table of the Elements

  10. Periodic table - Wikipedia