Dalton's atomic theory upheld the idea of the indivisibility of the atom and also the idea that atoms combine in whole number ratios.
According to Dalton's theory, atoms can neither be created nor destroyed. This means that we can not split helium atoms into two oxygen atoms. Doing this will imply dividing the atom.
In his theory also, the combination of atoms occur in whole number ratios, this means that an oxygen atom can not combine with 1.5 hydrogen atoms to form water since it is not a whole number ratio.
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