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It state that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass......

Dalton's Atomic Theory

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms...

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Answer :- The main postulates of Dalton's atomic theory are :-

• All matter is made up of very thin partucles.These small particles are called atoms.
• Atoms cannot be further broken down.They are tiny, indivisible and indestructible ultimate particles.
• Atoms can neither be created nor destroyed in a chemical reaction.
• All the atoms of a given element are identical in all respects having the same mass, size and chemical properties.
• Atoms of different elememts are different and have different mass, size and chemical properties.
• During chemical combination, atoms of different elements combine in a simple whole number ration to form compounds.
• The relative number and kinds of atoms are constant in a guven compound.
• Atoms of same elements can combine in more than one ratio to form more than one compound. For example:- Hydrogen and oxygen combine to give water and hydrogen peroxide.In water, two atoms of hydrogen combine with one atom of oxygen while in hydrogen peroxide, two atoms of hydrogen combine with two atoms of oxygen.

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