Exploring the Building Blocks of Matter: the Modern Atomic Theory

In the early 1800s, John Dalton, a British chemist, conducted experiments that led to the discovery that elements are composed of specific types of atoms. He introduced the atomic theory, which stated that atoms are indivisible and indestructible, and that atoms of the same element are identical, while those of different elements differ. Dalton also explained that compounds form when atoms of different elements combine. Over time, the atomic theory has evolved with new scientific discoveries, leading to the modern understanding of atomic structure.

What happens when atoms of two or more elements combine according to Dalton?

How has modern atomic theory evolved from Dalton's original theory?