1)An atom consist of a sphere of positive charge with negatively charged electrons embedded in it.2)The positive and negative charges in an atom are equal in magnitude,due to which an atom is electrically neutral.IT has no overall positive and negative charge.Thomson model of the atom is similar to that of a christmas pudding.The electrons embedded in a sphere of positive charge are like the dry fruits in a spherical christmas pudding.We can also compare Thomson’s model of an atom to a watermelon.The red edible part of watermelon represents the sphere of positive charge whereas the black seeds embedded in watermelon are like electrons. Thomson’s Model of an Atom: J. J. Thomson, in 1898, proposed that an atom possesses a spherical shape (radius approximately 10 –10 m) … – This model of atomic structure was compared to that of the structure of a watermelon or to a plum pudding.

It is compared with a watermelon because the sphere of positive charge represents the red, edible part of watermelon whereas electrons embedded in a positively charged sphere represent the black seeds. The first model of atom was proposed by J. J. Thomson in 1898. a. Thomson proposed the model of an atom to be similar to that of a watermelon. (Cathode ray tube is a vacuum tube). He demonstrated the process of ionization of the air by X-rays along with Rutherford. Therefore, this model is also referred to as the watermelon model, the plum pudding model or the raisin pudding model. Basically, the red edible part of the watermelon consisted of the positively charged sphere while the seeds of the watermelon was said to consist the negatively charged particles. His atomic model is also known as the plum pudding model owing to the resemblance to the watermelon.– He said that an atom consisted of a sphere which was positively charged with the negatively charged electrons filled into it. She has started this educational website with the mindset of spreading Free Education to everyone.Can you help me to do thomson model of atom as an projectQuestion 2 Which subatomic particle was not present in Thomson’s model of an atom?Question 3 Why Thomson’s model is called as Plum pudding model of an atom? Thomson was the first scientist to propose a model for structure of an atom.When J.J. Thomson proposed his model of the atom in 1903,then only electrons and protons were known to be present in the atom. J.J. Thomson believed that the electron was two thousand times lighter than that of a proton and assumed that the atom contains thousands of electrons that possess the negative charge. In this article, we shall study Thomson’s model of an atom and its deficiencies and Rutherford’s atomic model and its deficiencies. The discovery of the electron was done through the cathode ray tube experiment. Was this answer helpful? J.J. Thomson was the scientist who discovered the negatively charged particle called electron in 1897. ATOMIC MODELS.

It is also known as plum pudding model or watermelon model. The stability of the atom was explained as a result of the balance between the repulsive forces between the electrons and their attraction towards the centre of the positive Sphere.This model is compared with a watermelon in which seeds are embedded or with … Thomson atomic model is compared to watermelon. It resembles a plum pudding because the electrons in the model look like the dry fruits embedded in a sphere of positive charge just like a spherical plum pudding. Another way to prevent getting this page in the future is to use Privacy Pass. Where he considered: Watermelon seeds as negatively charged particles; The red part of the watermelon as positively charged; Limitations of Thomson’s atomic model The atom as a whole was said to be neutral while the negative and the positive charge inside the atom was equal.WHAT ARE THE LIMITATIONS OF THOMSON’S ATOMIC MODEL?– This atomic model failed in its explanation of how is the positive charge in the atom capable of holding the negatively charged electrons in the atom and therefore failed to explain how the atom becomes stable in nature.– This atomic model could not explain or account for the position of nucleus in the atom.– This model also failed in its part to explain the alpha particles scattering.His model was disproved by Ernest Marsden’s and Hans Geiger’s gold foil experiment in 1904. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Thomson model of the atom is similar to that of a christmas pudding.The electrons embedded in a sphere of positive charge are like the dry fruits in a spherical christmas pudding.We can also compare Thomson’s model of an atom to a watermelon.The red edible part of watermelon represents the sphere of positive charge whereas the black seeds embedded in watermelon are like … J. J. Thomson proposed the watermelon model of atom which is also known as plumb pudding model in which electron are present inside the atom like plumb in the pudding. – This model of atomic structure was compared to that of the structure of a watermelon or to a plum pudding. 8 The study of the atomic structure and the atom as a whole has provided the base for numerous inventions that has played an elementary role in the development of the mankind.India's leading science and education online publication.Copyright © 2020 JustScience All Rights Reserved. Thomson was the scientist who discovered the negatively charged particle called electron in 1897. Postulate 2: An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude. JJ Thompson proposed that an atom consists of negative and positive parts with the negative parts embedded in the positive part (much like seeds of a watermelon).


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