The Development of Atomic Theory

How scientists discovered atom

Oct 2, 1808

In 1808, John Dalton proposed a fundamental building block for all matters. In 1897, J.J Thomson discovered protons and electrons. In 1911 Rutherford discovered the nucleus. In 1913, Bohr discovered electron shells. In 1926 Schrodinger discovered sub-shells. In 1932, Chadwick discovered neutrons