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Dalton's Atomic Theory

John Dalton first provided the explanation for the laws of chemical combination, in 1809.

John Dalton

In order to explain these laws, Dalton established the model of an atom. He suggested that atoms were indivisible solid spheres.

The essential postulates of this theory are given below:

  1. Matter is composed of atoms, which cannot be created or destroyed.
  2. All the atoms of one element are alike (i.e. they have the same size, shape and mass) but are different from those of any other element.
  3. In compounds, atoms combine together in the ratio of small whole numbers and are held together by chemical forces. The smallest entity of a compound is known as a molecule.

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