Question

give postulate of dalton atomic theory

Answer 1

John Dalton, a British school teacher, published his theory about atoms in 1808. His findings were based on experiments and the laws of chemical combination.

Postulates

All matter consists of indivisible particles called atoms.

Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.

Atoms cannot be created or destroyed.

Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.

Atoms of same element can combine in more than one ratio to form two or more compounds.

The atom is the smallest unit of matter that can take part in a chemical reaction.

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Answer 2

Dalton → John Dalton

He used to fundamental laws of chemical combination that are the law of conservation of mass and law of constant proportion as the basis of his atomic theory.

Conclusion of Dalton's atomic theory : 

Atom is the smallest particle of an element which cannot be further divided and that retains all the characteristic properties of that element.

Some assumption and postulates of Dalton's theory are: 

• An atom cannot be further divided into still smaller particles.

• Atom can neither be created nor be destroyed in the chemical process.

• The atom of one element are different from those of any other elements.

• Atoms of different elements make combine in simple whole number ratio to form compound atoms of a new substance.

• All forms of matter are made up of very small discrete particles called atoms.

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