PART_2 WHAT IS DALTON'S ATOMIC THEORY?A theory of chemical combination, first stated by John Dalton in 1803.What were the 5 most important points in Dalton's atomic theory?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.Postulates of Dalton's atomic theoryAll 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.John Dalton's contribution to the atomic theory.Dalton's theory was based on the concept that each element consists of its own unique brand of indivisible atom.