J.J. Thomson's atomic atomic model was called the Plum Pudding Atomic Model, and it was based on the idea that electrons are negatively charged particles scattered through out the positively charged atom. While Thomson was right about the existence of electrons, he was wrong on where they are located within the atom.Know More
Thomson compared the way that the electrons are scattered throughout the atom to the raisins of a plum pudding. This theory suggested that the negative and positive charges in the atom existed in the same sphere of existence, but it wasn't until 1911 that the location of the nucleus that housed these charges was discovered. The man who discovered the nucleus, Ernest Rutherford, was a student of Thomson at one time and was actually testing Thomson's theory when he made his own discovery: rather than being scattered throughout the atom, electrons orbit a positively charged nucleus. Once Rutherford had discovered that particles in foil were able to deflect the H2+ particles in 1911, the plum pudding model was set aside for Rutherford's model. Thomson also abandoned his own model to support Rutherford's model.
Throughout Thomson's career, he held a number of distinguished positions due to his discoveries. He was given a knighthood in 1908 by the British Royal family in addition to a Nobel Prize in 1906. Even though Thomson's plum pudding theory was disproved, many of the elements of his discoveries such as electrons were key to finding and building the model that is used currently.Learn more about Chemistry
Erwin Schrödinger invented the electron cloud model of the atom. This atomic model does not specifically pinpoint where an electron is likely to be as the Bohr model does. Instead, it depicts all the positions where an electron might be, which generates a cloud of possible locations that gets denser as it approaches the nucleus.Full Answer >
Democritus' model of the atom was simply a round, solid ball. Democritus knew nothing of separate protons, neutrons and electrons; all he knew was that everything physical was composed of atoms, according to Boise State University. Democritus concluded, "Nothing exists except atoms and empty space."Full Answer >
Erwin Schrodinger’s atomic cloud model revolutionized the way scientists viewed the structure of the atom. Building on the work of Neils Bohr, Schrodinger demonstrated that it was impossible to determine the exact location of the electron at a particular point in time. Instead, Schrodinger’s model showed that an electron could be found in some portion of an electron “cloud” at any specific point in time.Full Answer >
Sir Joseph John Thomson, a British physicist, discovered the electron in 1897. In experiments studying electric discharge in cathode tubes, he noted a high value for the ratio of charge to mass. His observation led him to identify the first subatomic particle, the electron.Full Answer >