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The main points of Dalton's atomic theory were:Elements are made of extremely small particles called atoms.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.Atoms cannot be subdivided, created, or destroyed.Atoms of different elements combine in simple whole-number ratios to form chemical compounds.In chemical reactions, atoms are combined, separated, or rearranged.
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The postulates of John Dalton's theory are-
-elements are composed of extremely tiny particles known as atom.
--atoms cannot be created or subdivide or destroyed.
--all atoms of a particular elements are identical in all respects but different from atoms of other elements.
--atoms combine in simple whole number ratios.
--a chemical change involves the combination, separation or rearrangement of atoms

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