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  • Earlier classification of elements was based on similarities
  • Mendeleev’s arrangement of elements is based on increasing order of atomic mass and the chemical properties of elements
  • Merits and demerits of Mendeleev’s periodic classification
  • Modern periodic table has the elements arranged in the increasing order of atomic number
  • It has 18 vertical columns called groups and 7 horizontal rows called periods
  • Elements show periodicity in the properties along groups and periods.

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