Development of the periodic table
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From early attempts to the modern table

From early attempts to the modern table

Flowchart showing early atomic weight order, Mendeleev's gaps, confirmed predictions, and the modern atomic number table with tellurium before iodine The periodic table is designed to show repeating patterns in the properties of elements. Early chemists could compare masses and reactions, but they did not know about protons, so they could not arrange elements by atomic number.

Development of the periodic table Lesson

  1. GCSE
  2. /Chemistry
  3. /Development of the periodic table