What are the postulates of Dalton's atomic theory?

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 of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )

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Postulates of Dalton's atomic theory:

⇒ All matter is made up of very tiny particles called atoms.

⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

⇒ Atoms of a given element are identical in mass and chemical properties.

⇒ Atoms of different elements have different masses and chemical properties.

⇒ Atoms combine in the ratio of small whole numbers to form compounds.

⇒ The relative number and kinds of atoms are constant in a given compound.

⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.

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the answers would be

the first one and the second one