What is the Thomson contribution to the atom model theory?

Answer 1

J J Thomson was the first person to suggest the theory of the atom containing positive and negative particles, and demonstrated the latter which he called electrons. He experimented with cathode ray tubes to show how electron beams were deflected by magnetic forces. He also showed the hydrogen atom has one electron. He worked at Cambridge EnglandHis atomic theory identified that electrons inside an atom could show, meaning that atoms were not invisible.

Thomson suggested that the model of an atom as a sphere of positively charged matter with negatively charged electrons surrounding them. He stated that electrons were positioned by electrostatic forces.

After the discovery of the electron and proton as subatomic particles J.J. Thomson had started to discover atomic theory that gives complete explanation of atomic structure.According to Thomson protons are embed in the atoms like a water melon and electrons are present in atoms to make the atom electrically neutral.his discovered atomic theory was not able to explain the atomic structure properly

Read more: What_was_JJ_Thomson's_major_contributions_to_the_atomic_theory. Awarded Nobel Prize in 1906.

Answer

J.J Thomson view of atom was on the electrons, like "raisins," are stuck into a lump of protons, like "dough," in a "plum pudding" atom.This is the "plum pudding" atom

Answer 2

J.J. Thompson was the person who suggested the plum pudding model for the atomic structure. He declared that the electrons are located between a cloud of the positive charges. This model was proven incorrect from the alpha particle experiment done by Ernest Rutherford.

Answer 3

The plum pudding model of the atom by J. J. Thomson, who discovered the electron in 1897, was proposed in 1904 before the discovery of the atomic nucleus. In this model, the atom is composed of electrons (which Thomson still called "corpuscles", though G. J. Stoney had proposed that atoms of electricity be called electrons in 1894[1]) surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively-charged "plums" surrounded by positively-charged "pudding". The electrons (as we know them today) were thought to be positioned throughout the atom, but with many structures possible for positioning multiple electrons, particularly rotating rings of electrons (see below). Instead of a soup, the atom was also sometimes said to have had a "cloud" of positive charge.

With this model, Thomson abandoned his earlier "nebular atom" hypothesis in which the atom was composed of immaterial vorticies. Now, at least part of the atom was to be composed of Thomson's particulate negative corpuscles, although the rest of the positively-charged part of the atom remained somewhat nebulous and ill-defined.

The 1904 Thomson model was disproved by the 1909 gold foil experiment, which was interpreted by Ernest Rutherford in 1911[2] [3] to imply a very small nucleus of the atom containing a very high positive charge (in the case of gold, enough to balance about 100 electrons), thus leading to the Rutherford model of the atom. Finally, afterHenry Moseley's work showed in 1913 that the nuclear charge was very close to the atomic number, Antonius Van den Broek suggested that atomic number is nuclear charge. This work had culminated in the solar-system-like (but quantum-limited) Bohr model of the atom in the same year, in which a nucleus containing an atomic number of positive charge is surrounded by an equal number of electrons in orbital shells.

Thomson's model was compared (though not by Thomson) to a British dessert called plum pudding, hence the name. Thomson's paper was published in the March 1904 edition of the Philosophical Magazine, the leading British science journal of the day. In Thomson's view:

... the atoms of the elements consist of a number of negatively electrified corpuscles enclosed in a sphere of uniform positive electrification, ...[4]

In this model, the electrons were free to rotate within the blob or cloud of positive substance. These orbits were stabilized in the model by the fact that when an electron moved farther from the center of the positive cloud, it felt a larger net positive inward force, because there was more material of opposite charge, inside its orbit (see Gauss's law). In Thomson's model, electrons were free to rotate in rings which were further stabilized by interactions between the electrons, and spectra were to be accounted for by energy differences of different ring orbits. Thomson attempted to make his model account for some of the major spectral lines known for some elements, but was not notably successful at this. Still, Thomson's model (along with a similar Saturnian ring model for atomic electrons, also put forward in 1904 by Nagaoka after James C. Maxwell's model of Saturn's rings), were earlier harbingers of the later and more successful solar-system-like Bohr model of the atom.

Answer 4

He just proposed that the atom was a positively-charged ball, studded with electrons. He didn't attempt any experiments to prove this, but it was an important step in the evolution of the model of the atom. A few years later, Rutherford carried out the alpha scattering experiment to test this model. He found out that the Thomson model could not explain the results of the experiment.

Answer 5

he discovered electrons in 1897, he performed experiments that involved passing electric current through gases at low pressures.

Answer 6

the information can be found here.

http://en.wikipedia.org/wiki/J._J._Thomson

Answer 7

no it is impossible that question is mostly the most retericle question in the world.

Answer 8

J. J. Thomson discovered the electron and the isotopes.