Question

Summarize the five points of Dalton’s atomic theory, and explain at least one change that occurred to the atomic theory because of further experimentation.

Answer 1

-Elements are made of extremely small particles called atoms
-Atoms of a given element are identical in size, mass, and other properties
-atoms of different elements differ in size, mass, and other properties
-Atoms cannot be subdivided, created, or destroyed

Answer 2

The postulates of Dalton's theory were:
1) Elements are made of extremely small particles called atoms
2) Atoms of a given element are identical in size, mass, and other properties
3) Atoms cannot be subdivided, created, or destroyed
4) Atoms combine in whole number ratio to form compounds
5) Chemical reactions are the rearrangement of atoms
The third postulate has been disproved by modern science, in which the atom has been split and been subdivided into smaller parts such as the neutron, proton and electron, which are further subdivided into quarks, gluons, and kaons.
The second postulate was also disproved upon the discovery of isotopes.