History of the Atom The atom has come a long way since it was first discovered. The following is an overview of it's history. 500-400 BC-    Multiple philosophers such as Democritus and Lucretius theorized about atoms. They thought that all objects where                          were made up of small particles but due to their time, they could not provide proof of their theory. 1800's-             John Dalton coined the atomic theory where he stated that all matter is made up of atoms and that atoms make up                              elements and compounds. He believed atoms could not be split but that was later disproved. Closer to the center of                          the century, Dimitri Mendeleev created the periodic table and discovered an impressive number of elements despite                          a lack of technology. Later on, Eugene Goldstein discovered protons using discharge tubes and magnetic fields and                          hinted the presence of a negatively charged particle. Becquerel went on to discover radioactivity through the                          observation of an element called uranium. To conclude the century for atomic discoveries, J.J. Thomson observed an                          experiment using cathode rays in a vacuum to discover the presence of electrons. 1900's-             Ernest Rutherford began the 20th century by discovering that atoms are composed of a very dense nucleus with lots                          of empty space through the gold foil experiment. He shot particles through a very fine sheet of gold and discovered                          that many of the particles went straight through while some of the others were deflected which meant that there must                          have been space between the atoms. Robert Millikan continued J.J. Thomson's discovery of the electron by using an                          oil drop experiment to determine the charge of a single electron at an impressive -0.0000000000000000001602                          coulombs. Further electron discovery was done by Neils Bohr where he discovered that electrons are found in orbits                          through the excitation of electrons and the color of light emitted. Frederick Soddy went on to discover isotopes,                          meaning the same elements just with varying neutron counts (though neutrons were not known knowledge at the                          time) and realized that radioactivity was due to the deterioration of an unstable atom. Heisenberg discovered that it is                          impossible to locate an electrons exact position and to know its energy at the same time. James Chadwick concluded                          the major discoveries of the 1900's by discovering the presence of the neutron in the nucleus of the atom which was a                          fundamental concept in the understanding of future quantum mechanics. Overview                           The idea of the atom was pondered on in the BC era by the most intelligent philosophers however science was not advanced enough to provide evidence at the time. The atom was discovered in the early 1800's and an atomic theory was developed. At first, very little was known about the atom and during Dalton's time, it was thought of as just a ball mass. Slowly, charges were discovered and once Thomson's discovery came around a "plum pudding" model had surfaced. This model theorized that the atom was a positively charged mass with electrons scattered throughout. Further breakthroughs disproved this model through experiments like Millikan's oil drop experiment which led to the Rutherford model depicting a dense nucleus with electron floating around it. Through further experimentation, it was deemed that electrons have designated paths which ultimately lead to our modern quantum mechanical model.    so play a very big role in powerlifting. Moments are created in joints like the knees, hips, ankles, elbows, and shoulders. The magnitude of the moment varies at different stages of the movement. For example, the moment about the knee is greatest when the lifters femur is perpendicular to the ground because the entire vertical load of the weight is farthest from the knee. Using the equation Moment = Force x Distance would be used in determining the magnitude of the force. Since the equation involves a cross product, a perpendicular load results in the greatest force. f     meters.