Class 9 Chemistry Atoms and Molecules Dalton atomic theory

Dalton’s atomic theory

 John Dalton

The postulates of this theory may be stated as follows:

  • Matters are composed of very tiny particles called atoms.
  • These particles are too small to see and cannot be created or destroyed in a chemical reaction.
  • Atoms of a specified element are identical in mass and chemical properties.
  • Atoms of different elements have different masses and chemical properties.
  • Atoms combine in the ratio of small whole numbers to form compounds.
  • The relative number and kinds of atoms are constant in a given compound.

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