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John Dalton: First Modern Atomic Scientist
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/atoms-molecules-and-ions-2/history-of-atomic-structure-32/john-dalton-and-atomic-theory-197-6138/ John Dalton was the first modern scientist to formulate that the atom was the basic building block of everything. He said that everything was composed of something small (atoms) and it cannot be made or destroyed. He also said that the atoms are made up the same way but have different masses and shapes. -
JJ Thompson Discovers the Electron
Picture and Info: http://www.britannica.com/EBchecked/topic/593128/Thomson-atomic-model JJ Thompson was credited with discovering the elcetron. His model, the plum pudding model, showed the electrons floating in positively charged matter. He discovered it never weight more than 1/1000 of the whole weight. He said that all matter contains negatively charged particles to balance out the positive matter around it. -
Einstien's Theory of Brownian Motion
Info: BBC Video and http://www.britannica.com/EBchecked/topic/81815/Brownian-motion In 1905, Einstien wrote a paper on Brownian Motion that was undeniable. He claimed that when Brown saw the particles move, something had to have moved them. Einstien said it was water atoms that were pushing the pollen atoms around, making them move. -
Rutherford's Gold-Foil Experiment P1
Class BBC Video
Picture:http://upload.wikimedia.org/wikipedia/commons/e/e8/Rutherford_atomic_planetary_model.svg Ernest Rutherford carried out the Gold-Foil experiment, He was using aplha partices to shoot radium through a gold foil and count how many gold particles come thorough the other end. After months of not seeing anything, Rutherford told on of his assistants to see the alpha particle box. At first, nothing appeared, then one day, the saw gold particles on the box. (Continue to Part 2) -
Rutherford's Gold-Foil Experiment P2
They determined one in 800 bounced back. Using this, they discovered that the atom is mostly empty with one strong nucleaus in the middle that bounces the atom back. Using this, they discovered the subatomic particles. -
Millikan's Oil-Drop Experiment
Info: http://www.britannica.com/EBchecked/topic/382902/Robert-Andrews-Millikan Robert Millikan's famous Oil-Drop Experiment was to see how much charge a negatice particle (electrons) had. It started off using water, but he changed to oil because the water evaporated to quickly. He placed oil droplets on a plate with holes and as they fell through the holes, the air's electrons would attach with them giving the oil a negative charge. He measured the charge by how fast the droplet would fall. -
Bohr Atomic Model
Info and Picture: http://www.britannica.com/EBchecked/topic/71670/Niels-Bohr Niels Bohr was a student of Rutherford at the University of Manchester. Using Rutherford's recent discovery, he thought that electrons can only orbit in certain locations determined by the quantum of action. He also believed that electromagnetic radiation only happens when the electron jumps to a lower energy level. -
Schrödinger Equation
Info: http://www.britannica.com/EBchecked/topic/528287/Erwin-Schrodinger Schrodinger was a supporter of Bohr's Quantum Mechanics. He made the papers that gave the basics of quantum wave mechanics. He claimed his eqaution was the basic form of quantum mechanics. The eqaution is functions that only relate to probable event occurances.
