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460 BCE
Democritus
He created the term Atom. Believed that your are able to divide something untill it cannot be broken down anymore. -
340 BCE
Aristotle
Disagreed with the Atomic Theory (Democritus). Believed in air, earth, water, fire and aether. -
Antoine Lavoisier
Created the law of conservation (Mass cannot be created nor destroyed) -
Evangelista Torricelli
Atmospheric pressure could push mercury up a tube to firgure. Came up with the barometer. -
Joseph Loius Proust
Discovered the law of definitive proportions which states that in any compound the elements are present in a fixed proportion by weight. -
John Dalton
adopted Democritus' theory into the first modern atomic model. -
J.J. Tomson
Credited for discovering the electron. Used the reasearch on a Cathode Ray Tubes. -
Niels Bohr
Electrons do not travel on a specific path or orbit. -
Ernest Rutherford
Set up the Gold Foil experiment, discovering there must be a positive centre of the foil. He called it a nucleus. -
Erwin Schrodinger
Made the Cloud Model. Found out where we can predict where an electron will be. -
Werner Heisenberg
Proposed the "Uncertainty Relation" setting limits for how precisely the position and velocity of a particle. -
James Chadwick
Found that Alpha particles have a neutral particle with about the same mass as a proton.