Nov 1, 1000
Aristotle Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, ect.. Together with Plato and Socrates. Aristotle is one of the most important founding figures in Western philosophy. Aristotle's writings were the first to create a comprehensive system of Western philosophy, encompassing
John DaltonJohn's theory:
John discribed atoms as indestructable shere shaped particles, with no internal structure. In his experiment Dalton realized from observations on the vapour pressure of six different liquids, that the variation of vapour pressure for all liquids is equivalent, for the same variation of temperature, reckoning from vapour of any given pressure.
J.J. ThomsonJ.J.'s theory:
In his theory J.J. discovers the electron, which lead to his " Plum Pudding" model. He describes electrons embadded in a sphere of positive elactric charge. Thomson was the first to suggest that the fundamental unit was over 1000 times smaller than an atom, suggesting the sub-atomic particles now known as electrons.
Hantaro NagaokaHantaro's theory:
Hantaro argues that an atom has a nucleus. and that the electrons orbitaround the nucleus. Hantaro's experiment was proven correct by Rutherford. However, other details of the model were incorrect.
Ernest MarsdenErnest's theory:
He met Ernest Rutherford at the University of Manchester. While still an undergraduate he conducted the famous Geiger-Marsden experiment called the gold foil experiment in 1909 together with Hans Geiger under Rutherford's supervision. In 1915 he moved to Victoria University College, New Zealand as Professor of Physics; he was recommended by Rutherford.
Ernest RutherfordErnest's theory:
He states that an atom has a dense, positively charged nucleus. And that electrons move randomly in the space around its nucleus. In his experiment the atom is made up of a central charge and has randomly orbiting electrons.
Niels BohrBohr's theory:
Niels believes that the electrons move in spherical orbits at fixed distances from the nucleus. Bohr was flown in a military aircraft to Britain. There he was introduced to the then-secret atomic bomb project. Eventually he was directed to the project's principal location in the United States of America.
Louis de BroglieLouis's theory:
Louis believes that moving paricles like electrons have some properties of waves. This took him a couple of years to offically have this theory proven. His theory was influenced by Einstein's introduction on photons in light waves
Erwin SchrodingerErwin's theory:
Schrodinger used algebric equations to describe the motion of electrons in atoms. Later on in his career this theory lead to the electron cloud model. In his experiment he concluded that these rays, rather than being a form of light, were composed of very light negatively charged particles he called "corpuscles".
James ChadwickJames's theory:
James confirms the exsistance of nuetrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons. In his experiment he found that a neutron measures slightly heavier than the proton with a mass of 1,840 electrons and with no charge.