What are the postulates of Dalton's Atomic theory?

(i) Matter is made up of atoms, which are extremely small particles and cannot be subdivided. Atoms retain their identify in all chemical reactions.
(ii) Atoms of the same element are similar in all respects, i.e., in shape, size, mass, etc.
(iii) Atoms of different elements are different in all respects and possess different properties. For example, sulphur and oxygen are entirely different in their properties and posses different atomic masses.
(iv) Atom is the smallest particle that can take part in a chemical combination.
(v) Atoms of the different elements combine in simple but fixed ratio to form compound atom.
(vi) Atoms are indestructible. They can neither be created nor destroyed during any physical or chemical change.