The Development of the Periodic Table

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  • Created by: tammy
  • Created on: 29-11-11 06:28

Newlands' Law of Octaves

  • Arranged according to the ascending order of the elements' atomic mass.
  • Every eight element, starting from a given one, had similar properties as the first one.

However, his classification was not accepted by the scientific community because:

  • Newlands' rule did not hold true at all for elements beyond calcium.
  • He did not leave blank spaces in his table for undiscovered elements.

Mendeleev's Periodic Table

  • Arranged the elements in order of increasing R.A.M.
  • He left gaps where necessary to ensure that similar elements were grouped together.
  • Vertical columns = groups
  • Horizontal columns = periods

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