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The Periodic Table, Early Periodic Table, Pair reversals, Rows = Across =…
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Early Periodic Table
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Pre discovery of Electrons, Protons and Neutrons
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Arranged the elements:
- In order of increasing atomic weights
- Accounted for the properties of the elements and their compounds, similar properties arranged in Groups
- Had gaps in it (for yet to be discovered elements)
Pair reversals
Isotopes
Atoms of an element with the same number of protons and electrons but different numbers of neutrons.
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Mendeleev 
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