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Democritus was famous for the discovery of the atom and because there was little to no technology due to the time he couldn't conduct an experiment.
John Dalton is known for discovering the modern atomic theory. Due to the time he could not conduct an experiment.
J.J Thomson discovered the electron. He performed experiments in 1897 designed to study the nature of electric discharge which proved Dalton's theory wrong.
Rutherford discovered that radioactive preparations gave rise to the formation of gases. He conducted his experiment in 1911. Rutherford's Gold Foil Experiment proved the existance of a small massive center to atoms. He conducted his experiment by firing energetic a [He2+] particles at a foil, and measured the deflection of the particles as they came out the other side.
Bohr's findings depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. His conducted his experiment in 1913 by studying the properties of atoms.
Austrian physicist Erwin Schrödinger conducted an experiment by building a model in 1926. His findings were that a dense nucleus surrounded by a cloud of electrons at various levels in orbitals.
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