postulates of Dalton's atomic theory were used to explain earlier observations
of the behavior of matter. His postulates were...
matter is composed of small, indivisible particles called atoms.
atoms of a given element are identical in mass and properties.
are formed by a combination of two or more atoms in definite arrangements in the
ratio of small whole numbers.
are not created, destroyed or converted into other kinds of atoms during
They are simply rearranged into new compounds.
postulates were accepted for most of the 1800's until new experiments indicated
atoms were made up of subatomic particles. These new experiments provided
evidence that postulates "a" and "b" were not correct.