Theory:

Merits of Atomic Theory:
  • Dalton's atomic theory explains the majority of the properties of gases and liquids.
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  • It explains the chemical composition law and the law of conservation of mass.             
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  • This theory aids in the identification of molecular changes between elements and compounds.    
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Drawbacks of Atomic Theory:
  • The atom is no longer thought to be the tiniest indivisible particle.
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Divisible fruit (similarly atom also divisible into proton, electron and neutron.)
  • Atoms of the same element have different masses (Isotopes).   
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  • Different elements' atoms can have the same mass. (Isobars).
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  • The properties of substances made up of the same type of atoms can vary.
Example:
(Coal, Graphite and Diamond are consists of carbon, but they have different properties)
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