GCSE Chemistry Unit 3 Revision

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History of the Periodic table

  • Until quite recently, there were only two ways to categorize elements: by physical or chemical properties or by their relative atomic mass.
  • In the 1800s, no one knew about atomic structure or protons and electrons, so people didn't know about atomic numbers.
  • The known elements were therefore arranged by atomic mass. When this was done, a periodic pattern was noticed in the properties of elements.
  • Newlands was the first to to try to arrange things in a better way in 1864. He noticed that every eighth element had…

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