![]() ![]() ![]() Thomson Atomic Model is not the most accurate model to explain the structure of an atom as it has various drawbacks but it was the first model to explain the basic structure of an atom that atom as a whole is neutral and it consists of positive and negative charge in equal magnitude. This was proved later by his cathode ray experiment which proved that atoms are made up of negatively charged particles called Electrons. Initially, scientists are of the view that atoms are indivisible and they did not believe the explanation of Thomson stating that atoms are made up of smaller particles. He stated that atoms are spherical shape objects in which electrons are embedded in a jelly-like substance and the jelly-like substance is called protons. The first scientific discussion about the structure of atoms was started by famous scientist JJ Thompsom in 1897. The model did not explain the presence of Isotopes.ĭespite these limitations, Thomson’s Atomic Model is an important step in the development of Atomic Theory and only after this theory, there came various theories that provide a better understanding of Atoms.The model could not explain the phenomenon of atomic spectra, which is the emission and absorption of specific wavelengths of light by atoms.The model could not explain the results of the gold foil experiment conducted by Rutherford, which showed that most of the mass and positive charge of an atom is concentrated in a small, dense nucleus at the centre of the atom.The model assumed that the positive charge was distributed uniformly throughout the atom. This model did not account for the presence of positively charged particles in the atom, which were later identified as protons by Ernest Rutherford.Some of the limitations of Thomson’s Atomic Model are: Thomson’s atomic model had several limitations that were eventually overcome by further research and the experiments of various scientists later on. Thomson’s model is also called Plum Pudding Model or Watermelon Model. An atom is an electrically neutral quantity and the total positive charge of the atom is balanced by the total negative charge in the atom.The positive charge of the sphere is uniformly distributed to balance the negative charge of the electrons. An atom consists of a positively charged sphere or cloud in which negatively charged electrons are embedded. ![]() Various Postulates of Thomson’s Atomic Model are mentioned below: The diagram explaining the Plum Pudding Model or the Thomson Atomic model is added below which shows that positive charge is spread throughout the atom and negative charge is embedded in the atom maintaining the electrical neutrality of the atom. We can also compare this with a watermelon where the positive charge is comparable to the edible part of the watermelon, and electrons are like seeds that are embedded in that sphere. Thomson’s Atomic Model, also called the Plum Pudding Model states that an atom can be compared to a plum pudding where electrons are like dry fruits in a sphere of positive charge, representing the pudding. The magnitude of the positive and the negative charge in the sphere is equal according to Plum Pudding Model. In this sphere, the positive charge is spread uniformly and the negative charge is embedded in this positive charge due to electrostatic attraction between the charge. According to Thomson, an atom represents a sphere of radius of magnitude in Angstrom. Thomson Atomic Model is also called the Plum Pudding model as it represents the Plum Pudding. Role of Mahatma Gandhi in Freedom Struggle. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |