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born around 460 BC and died around 370 BC. Created the theory that everything is composed of atoms. Atoms are physically but not geometrically, indivisible, that between atoms there lies an empty space and atoms are also indestructible. -
Discovered the atom in 1808 based his theory off of the law of conservation of mass and the law of constant composition. -
Discovered the atom on 17 February 1869, he jotted down the symbols of the chemical elements putting them in order by their atomic weight. Which created the Periodic Table -
Discovered anode rays. He concluded that in addition to the electrons or cathode rays, that travel from negatively charged cathodes towards positively charged cathodes. -
In 1897 discovered the electron which lead to him proposing the model of the structure of an atom. -
German physicist who discovered the quantum of action, now referred as Planck’s constant h. His work laid the foundation for quantum theory -
Discovered electric charge using the oil drop experiment. He charged droplets of oil in between two electrodes. -
1911 he discovered the nuclear structure of the atom. His experiments showed when alpha particles are fired into gas atoms, a few are violently deflected. -
He proposed a theory for the hydrogen atom, which based on quantum theory that some physical quantities only take discrete values. (Nucleus)
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Discovered the uncertainty principle. Which states that a particles position and momentum cannot both be known exactly. -
Austrian physicist formulated a wave equation that accurately calculated the energy levels of the electrons in atoms. -
1932 He proved the existence of neutrons. Neutrons are elementary particles that devoid electronic charges