Class 9 Chemistry Structure of The Atom Introduction


  • Atoms and molecules are the building blocks of matter.
  • The word atom has been derived from the Greek word “a-tomio” which means “un-cuttable” or “non-divisible”.


  • Earlier it was believed that atoms are indivisible and don’t have any inner structure.
  • At the end of 19th century scientists carried out the experiments which proved that the atoms are divisible.
  • Dalton’s atomic theory which was proposed by John Dalton, considered the atom as the ultimate particle of matter.



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