In one of his theories Dalton states that?

In one of his theories, John Dalton proposed that all matter is composed of tiny, indivisible particles called atoms. He suggested that atoms of a given element are identical in mass and properties, while atoms of different elements have different masses and properties. Dalton's atomic theory laid the groundwork for modern chemistry by introducing the concept of atoms as the fundamental building blocks of matter and explaining how they combine to form compounds.