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The key postulates of dalton atomic theory are:
1) All matter is made up of tiny, indivisible particles called atoms.
2) All atoms of a specific element are identical in mass, size and other properties. Hoever atoms of different elements exhibit different properties and vary in mass and size.
3) Atoms can neither be created nor destroyed. Furthermore, atoms cannot be divided into smaller particles.
4) Atoms of different elements can combine with each other in fixed whole-number ratios in order to form compounds.
5) Atoms can be rearranged, combined, or separated in chemical reactions.