Final answer:
The law that does not follow from Dalton's atomic theory is the concept of isotopes. Dalton believed that all atoms of a specific element were identical, including their mass. Yet, isotopes, which are atoms of the same element with different masses, contradict this original assumption.
Step-by-step explanation:
Dalton's atomic theory, initiated by English schoolteacher John Dalton in 1807, provided a basis for understanding the properties of matter. Dalton's atomic theory includes several postulates: that elements are composed of atoms, atoms of the same element have identical properties, atoms of different elements have different properties, and compounds form when atoms combine in simple, whole-number ratios.
However, this theory does not account for the concept of isotopes. Isotopes are variants of a particular element that have different masses due to a different number of neutrons. Dalton originally believed that all atoms of a particular element had identical properties, including mass, which doesn't account for isotopes. To accommodate isotopes, the atomic theory was modified to state that atoms of the same element have identical chemical properties, but not necessarily physical ones.
Learn more about Dalton's Atomic Theory