History of the Periodic Table

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Early 1800s

They had no idea of atomic structure or of Protons and Electrons, so atomic number did not exist to them

They could only measure relative atomic mass therefore the known elements were arranged in order of atomic mass. When this was done a periodic pattern was noticed in the properties of the elements. This is where the name of the Periodic Table comes from.

Elements were catergorised into: their physical and chemical properties, their relative atomic mass

Newlands' Law of Octaves

Newlands in 1864 noticed that every eighth element had similar properties so he listed some of the

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