Question

Any two failures of Dalton's atomic theory

Answer 1

Failures

There was one problem with Dalton's atomic theory. It  was that it claimed that all matter is composed of tiny indivisible atoms. Now, in 2013, atoms are divisible and are composed of smaller, subatomic particles called electrons, protons, and neutrons. He stated that atoms of an element are identical in mass. This is not correct because all elements have isotopes --

I know only one..

Answer 2

Atoms are the smallest subsubstance of an element but they can also be divided into electrons protons and neutrons