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  1. Periodic Table - Ptable

  2. Oxygen (O) - Periodic Table

  3. Periodic Table of Elements - PubChem

  4. Oxygen | O (Element) - PubChem

  5. Oxygen (O) - Periodic Table

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

  7. Oxygen @ Periodic Table of Chemical Elements

  8. Oxygen (O) [8] — Chemical Element — Periodic Table - ChemGlobe

  9. Oxygen - EniG. Periodic Table of the Elements

  10. Oxygen (O) - Periodic Table [Element Information & More]