Question

: What are the postulates of Dalton’s atomic theory?

Answer 1

Dalton's atomic theory was one of the early theories that explained the origin and properties of matter around us. All chemical reactions take place through law of definite proportions and conservation of mass which could be explained by this theory.

Complete answer:
The postulates given by Dalton’s atomic theory helped in determining the basic constituents of different types of matter. The existence of atoms, their properties and rules of combining helped in understanding the mechanism of most inorganic reactions and also the role of stoichiometric coefficients became evident.
The postulates given by Dalton are as follows:
The matter consists of atoms that are the basic building block and cannot be fragmented further.
The atoms that belong to one particular element are identical in mass and have all other identical properties. Atoms of different elements have different masses.
Compounds consist of atoms of different elements that combine together to produce a new molecule. The molecule always has the same number of atoms combining in a fixed ratio.
Atoms cannot be prepared or synthesized, they can only be rearranged or reorganized through chemical reactions. It is impossible to create or destroy atoms of any element.

Note:
Dalton claimed that the atoms were indivisible at a time when the subatomic particles like electrons, protons and neutrons were not discovered. Except for the indivisibility, all observations and properties of atoms stated by Dalton are correct till date.