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  1. John Newlands (chemist) - Wikipedia

  2. John Newlands | Periodic Table, Atomic Theory, Elements ...

  3. Development of the periodic table - The Royal Society of ...

  4. Developing the periodic table - BBC Bitesize

  5. A brief history of the periodic table - American Society for ...

  6. John Newlands Contributions to the Periodic Table

  7. Law of octaves | Definition & Facts | Britannica