Question

List one statement from Dalton's atomic theory that has been disproven by later experiments and findings. Explain the findings that changed the statement you listed.

Answer 1

"All elements are made up of small indivisible particles called atoms"

Earnest Rutherford was able to show in his own atomic theory that the atom is not an indivisible solid entitity, but made up of three main sub-atomic particles: proton, neutron and the electron.

Answer 2

http://en.wikipedia.org/wiki/John_Dalton#Five_main_points_of_Dalton.27s_atomic_theory
>>>according to the above link ,the third point(Atoms cannot be subdivided, created, or destroyed.) is not true bcoz we know much about nuclear fission and fusion.

>>>and the 4th point [Atoms of different elements combine in simple whole-number ratios to form chemical compounds.] is probably not agreeable according to polymer chemistry, where we actually deal with fractional combinations.

>>>and the second point[Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.] doesn't explain the isotopes and isobars