DALTON'S ATOMIC MODEL

  • John Dalton was an English scientist and a school teacher.
  • In 1808 he formulated a precise definition of the invisible building blocks of matter that we call 'atoms'.
  • Dalton's atomic theory based on four assumptions.
  1. Elements are made out of extremely small,indivisible particles called 'atoms'.
  2. All atoms of a given element are identical in mass and size but the atoms of one element are different from the atoms of all other elements.
  3. Atoms of one element can not be changed into atoms of a different element by chemical reactions;atoms are neither created nor destroyed in chemical reactions.
  4. Compounds are formed by union of two or more atoms of different elements in simple mumerical ratio.
  • He suggested that all matters was made up tiny spheres that were able to rebounce around with perfect elasticity and called them as atoms.
  • Dalton's atomic model is called as the Golf ball model.
John Dalton

Atomic Model



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