Answer:
He discovered it by Experiments and that led John Dalton to finding his theory !
Explanation:
Experiments with gases that first became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom based on the following assumptions. Atoms of different elements combine in simple whole numbers to form compounds, 5. Atoms cannot be created or destroyed.
ℍ : Dalton discovered that oxygen combined with either one or two volumes of nitric oxide in closed vessels over water and this pioneering observation of integral multiple proportions provided important experimental evidence for his incipient atomic ideas. Ps: I usally dont answer but I tried :D !
By using law of conservation of mass and constant proportions Dalton’s atomic theory or model was established.
Dalton considered the matter is made up of atom which is the smallest, indivisible unit of matter.
His model suggested that atom is a ball-like structure, symbolized different atoms.
Different postulates of this theory are every atoms are identical, same size, shape, mass and other properties.
It can neither be created nor be destroyed and cannot be subdivided in a chemical reaction.
Atoms of different elements in a simple but fixed ratio and produce compounds by forming different bonds.
In a chemical reaction where the atoms are arranged and form new product but the number of atom remain same before and after reaction.
Learn more about atomic model, here:
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