these accomplishments was the atomic theory. Dalton was the first scientist to propose that all matter was made up of atoms. His theory was that elements consisted of very small particles called atoms. It also states, elements are pure or one of a kind; meaning all atoms in the element are identical. Although different elements had different size and mass, an element such as this is called a compound. In 1803 Dalton created the original chart of atomic weights and discovered atoms cannot be destroyed. Another scientist that played a big part in the atomic theory but differs from Dalton, is Niels Bohr. Bohr was a Danish physicist who made major and fundamental contributions to the understanding of the atom/atomic theory. His theory