What is Dalton’s Atomic Theory?

Although the origin of idea that matter is composed of small indivisible particles called ‘α tomio’(which means – Indivisible) dates back to the time of Democritus, a Greek Philosopher. This idea of Indivisible particles again started emerging as a result of several experimental studies which led to laws of Chemical Combinations like Law of Conservation of Mass, Law of Definite Proportions etc.

In 1808, Dalton published a book titled “A New System Of Chemical Philosophy” in which he proposed the following: –

  1. Matter consists of individible atoms.
  2. All atoms of a given element have identical properties, including identical mass. Atoms of different elements differ in mass.
  3. Compounds are formed when atoms of different elements combine in a fixed ratio.
  4. Chemical reactions involved reorganisation of atoms. Atoms are neither created nor destroyed in a chemical reaction.

These are main kind of clauses of Dalton’s Atomic Theory.

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