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  1. Hydrogen atom - Wikipedia

  2. Hydrogen – Protons – Neutrons – Electrons – Electron Configuration

  3. Hydrogen - Wikipedia

  4. Hydrogen - Periodic Table and Atomic Properties - Material …

  5. Hydrogen (H) - Periodic Table

  6. Hydrogen - Element information, properties and uses | Periodic …

  7. Hydrogen | Properties, Uses, & Facts | Britannica

  8. What Is a Proton? Definition and Properties - Science Notes and …

  9. DOE Explains...Protons - Department of Energy

  10. 8.2: The Hydrogen Atom - Physics LibreTexts