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John Dalton
John believed that there's always a point in a substance that it becomes indivisible. He thought atoms were like building blocks and eberything comes to the point where it can't get smaller. one experiment he did to prove this was mixing gases and observing how they settled to understand different types of atoms and densities. -
J.J, Thompson
Thompson used cathode rays in a tube with an electric charge running through it to discover the electron. In order to prove there was a negative charge, he had to put something to repel the particles, so he used a positive and negative charge on each side of the tube and sure enough they deflected. this image shows the model of the atom at that time 2011modelsb.wikispaces.com -
Albert Einstein
Einstein proved the existence of atoms by watcihng the movement of pollen in water under a microscope. The jiggling of the pollen could only be explained by water molecules existence. He also proved this with a lot of math. -
Ernest Rutherford
While shooting a thin piece of foil with particles, Rutherford noticed the particles werent just schooting right on through( which is what theyd be doing if the plum pudding model was accurate). He notices the particles changing direction and even rebounding. This was the discovery of the nucleus of an atom, that it has a dense, central part to it. -
Robert Millikan
Millikan discovered the charge of an electron using a tube with two conducting plates at either end. He putdrops of oil in the tube to observe it and learn its velocity and mass in order to calculate the charge. -
Niels Bohr
Bohr knew there was a nucleus to an atom, what about the electrons? He noticed it wouldnt make sense if they were just floating around aimlessely, or theyd collapse into the nucleus. He discovered electrons of an atom stay in set orbital shells and the way they are arranged in the shells affects how the atom behaves and interacts with other atoms' electrons.
This image demonstrates a Bohr model, it has a full valence orbital http://3.bp.blogspot.com/-xoIJjMjEb8I/UJRC7oPhwPI/AAAAAAAAA9M/I9I -
Edwin Schrodinger
Edwin figured out that it is very difficult to accurately locate an electron's exact location. Using math, he found the probability of finding an electron in a certain place. Out of this, came the electron cloud model also called the Quantum Mechanical model. The picture shows the most likely areas to find an electron. http://picsbox.biz/key/erwin%20schrodinger%20electron%20cloud%20model
