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

that atom is the smallest form of matter. later, scientist found out that maatter was constituted by protos,electrons nucleus and quarks.

Answer 2

and even pi mesons and many more until recently,, they have claimed that they have found out higgs boson.

Answer 3

Here's two more:
1) "Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties." Later it was discovered that isotopes of different elements exist which contradict this statement.

2) "Atoms cannot be created or destroyed". We now know that atoms can be destroyed through nuclear processes.