Dalton’s Atomic Theory:

Main postulates of Dalton’s atomic theory are as follows:

1. All elements are composed of tiny indivisible particles called atoms.
2. Atoms of a particular element are identical. They have same mass and same volume.
3. During chemical reactions atoms combine or separate or re-arrange. They combine in simple ratios.
4. Atoms can neither be created nor destroyed.

Dalton was able to explain the quantitative results that scientists of his time had obtained in their experiments. He nicely explained the law of chemical combinations. His brilliant work became the main stimulus for the rapid progress of the chemistry during the nineteenth century.