Thought that the world was made up of smaller things. "by convention bitter, by convention sweet, but in reality atoms and void"
Thought the World was made up of five Elements, These Include: Earth, Air, Fire, Water, Aether
Proposed the Atomic Theory by combining both Democritus and Aristotle's Theories.
Joseph John Thomson
Studied "canal rays" and found they were associated with the proton H +
Studied radiations emitted from uranium and thorium and named them alpha and beta.
used the idea of quanta (discrete units of energy) to explain hot glowing matter.
Found out that the charge of the Electron is Neutral
Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.
Louis de Broglie
He proposed that electrons could behave as waves under some conditions
dwin Schrodinger stated that rather than electrons being distributed within an electron configuration of shells and energy levels, they were arranged in orbitals which were systematically distributed within Electron Clouds.
Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle.