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400
Democritus 400 BC
He hypothesized that the smallest part of an object was an Atom.
He figured this out by thinking about cutting a tree in half and then that half in half etc.
Bennett, Linda. "What Democritus Thought." Democritus Model. N.p., n.d. Web. 18 Feb. 2015. -
John Dalton
Dalton discovered the atoms of a certain element are all the same, down to the very last atom.Atoms of divergent elements can be told apart by their atomic weights.Dalton reached a conclusion by experimenting and examinig the results in a empirical fashion.Dalton used experimenting and developing laws such as law of multiple proportions and law of definite proportions. Dalton pictured the compounds between any two elements is one atom each.
"John Dalton's Atomic Model." Universe Today. N.p., 0 -
Thomson
He Proposed that the atom had protons and electrons mixed uniformily throughout.
The model he made is known as the Plum Pudding model.
The method he used was called the cathode tube.
"PBS Atomic Theory." PBS. PBS, n.d. Web. 23 Feb. 2015. -
Rutherford
Rutherford discovered that atoms are not solid and have space in it.
He found that electrons moved around in an orbit like movement around a nucleus of protons.
He found this by doing the gold foil experiment. He called this the planetary model.
De Leon, N. "Rutherford Model of the Atom." Rutherford Model of the Atom. N.p., n.d. Web. 19 Feb. 2015. -
Rutherford
Rutherford explained that if Thomson's model was valid, the mass of the atom was dispersed throughout the atom.Rutherford used alpha rays (shooting a beam of alpha particles).He pictured the atoms looking like raisins scattered around in pudding.
Rutherford Model of the Atom." Rutherford Model of the Atom. N.p., n.d. Web. 19 Feb. 2015. -
Heinsenberg and Schrodinger
Heinsburg and Schrodinger discovered that by performing an experiment to see where a particle is located,you will find something particle-like.The two scientists used the Two-Slit Experiment for looking at the dual wavel particle nature of electrons.Two-Slit Experiment is what Schrodinger used to make his discovery on Quantum Physics(atom).Heinsburg on the other hand revealed the "matrix" form of quantum mechanics which is the equation form in order to discover more levels of quantum mechainics.
