Dalton determined and believed that elements developed from atoms, and that different elements can be differed and distinguished from each others weight. He also was able to discover that atoms cannot be destroyed or created. (Witch is a true statement and correct theory). Some of his past main statements were proven wrong such as: The atoms of different elements can be distinguished from another by there respective relative weights, and that atoms cannot be created, divided into smaller particles, a chemical reaction simply changes the way atoms are grouped together. Other than that, his main popular theries were correct and stable.