Which of Dalton's POINT PROVEN FALSE?

One of Dalton's key points that has been proven false is the idea that atoms of a given element are identical in mass and properties. In reality, atoms of the same element can have different masses due to the existence of isotopes, which contain varying numbers of neutrons. Additionally, the notion that atoms cannot be subdivided has been disproven, as atoms can be broken down into subatomic particles (protons, neutrons, and electrons).