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2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I

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There are thousands of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.

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1803

Dalton's Postulates About The Elements

Around the year 1803 in Manchester, John Dalton gave a series of lectures in which he presented his postulates:

  • Elements are made of tiny particles called atoms.
  • The atoms of a given element are different from those of any other element, and the atoms of different elements can be distinguished from one another by their respective relative atomic weigh/mass.
  • All atoms of a given element are identical.
  • Atoms of one element can combine with atoms of other elements to form chemical compounds, and a given compound always has the same relative numbers of types of atoms.
  • Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process, and a chemical reaction simply changes the way atoms are grouped together.

From a very early notebook from around this time:

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Periodic Table, What is it showing?
Binary Compounds

© Mark R. Leach 1999-


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