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</html>";s:4:"text";s:15301:"4. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. embedded in it.The negative and positive charges are equal in magnitude. Structure of Atoms - Class 9 Science Chapter 4 Test - Online courses with Quizzes, Notes, Videos mapped with CBSE Syllabus. This model explained the description of an inner structure of the atom theoretically. 1. Answer: On the basis of his experiment, Rutherford put forward the nuclear model of an atom, which had the following features: An atom consists of a positively … On discharge of electricity through gases, it became clear that an atom consists of positive and negative charges. Explain the postulates of Thomson’s model of an atom. An atom consists of a positively charged sphere with electrons embedded in it. asked Oct 16, 2020 in Chemistry by Saadhvi (54.5k points) structure of atom; class-9; 0 votes. These important extra questions are taken from NCERT Textbooks 2021-2022 only. In Rutherford’s model of the atom, an accelerating electron should gradually lose energy and eventually spiral into the positively charged nucleus. A. Syllabus. Thomson’s atomic model was also called as the plum pudding model or the watermelon model. During cathode ray tube experiment, a negatively charged particle was discovered by J.J. Thomson. State two main postulates of Thomson’s model of an atom. So Rutherford’s model was not in accordance with Maxwell’s theory and could not explain the stability of an atom. Thomson's atomic model failed to explain how the positive charge holds on the electrons inside the atom. Postulates of Thomson’s Atomic Model: On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. According to Thomson’s model of the atom, an atom consists of both negatively and positively charged particles. Electrons are embedded into this sphere, and the total positive charge of the sphere is equal to the total negative charge of electrons, and hence, the atom remained electrically neutral. As you all know, we come across different substances around us that constitute matter. Following Rutherford’s planetary model of the atom, it was realized that the attraction between the electrons and the protons should make the atom unstable Bohr proposed a model in which the electrons would stably occupy fixed orbits, as long as these orbits had special quantized locations J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. (a) Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment. Of these models, the models proposed by J.J. Thomson and Ernest Rutherford are of great significance as they paved the way for modern structure of an atom. On this basis Thomson proposed a model for the structure of atom. NCERT Exemplar Class 9 Science is very important resource for students preparing for IX Board Examination. Q. Limitations of Thomson’s Atomic Model. It also failed to explain an atom's stability. The positive charge in … Thomson's and Rutherford's Atomic Model Thomson’s Model of Atom. An atom is composed of a positively charged sphere in which electrons are embedded. The negatively charged particles are embedded in … = 23 No. Atom has a center known as a nucleus. Bohr's Atomic Model. According to this model, an atom consists of a sphere of positive charge. In this model, the atom consists of electrons (which Thomson called them "corpuscles") surrounded by a soup of positive charge to counteract the negative charges of the electrons, like "plums" charged negatively surrounded by "pudding" charged positively. Most of the space in atom is empty. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. SOLUTION: According to Thomson’s model of an atom : A. Postulates of Thomson’s model of an atom: (i) An atom consists of a positively charged sphere and the electrons are embedded in it. NCERT free solutions for class 9 science chapter 4 Structure of the Atom. Question from very important topics are covered by NCERT Exemplar Class 9.You also get idea about the type of questions and method to answer in your Class 9th examination. The electrons were assumed to be positioned in revolving circles throughout the atom. This means that electrons should eventually fall in the nucleus; leading to the collapse of the atom. True | False. Question 3. Negatively charged electrons are embedded in the sphere like plums in the pudding, or like the seeds in the edible red interior of a watermelon. 10. This theory was not able to explain the existence of isotopes. Question 4: Describe Bohr’s model of the atom. Thomsons Model of an Atom. 9. What are valence electrons? ... Thomson’s model explained the electrical neutrality but failed to explain the various experiments carried out by other scientists like Rutherford. This is the collection of frequently asked questions in different Public Schools, Kendriya Vidhyalaya and … According to Thomson’s model of the atom, the atom is a sphere of positive charge with negatively charged electrons embedded in it. It is a subatomic model of an atom. Thomson atomic model was proposed by William Thomson in the year 1900. The current model of the atom insisted that electrons move around the nucleus in orbits. Class 9 Science Chapter 4 Extra Question answers are given below with complete explanation. Drawbacks of Rutherford’s model of the atom: Was unable to explain the stability of an atom The theory was incomplete as it did not mention anything about the arrangement of electrons in Thomson’s model of an atom is similar to a plum pudding. Postulate 1: An atom consists of a positively charged sphere with electrons embedded in it Postulate 2: An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude Thomson atomic model is compared to watermelon. Where he considered: J.J Thomson Model. First proposed by J.J. Thomson in 1903 soon after the discovery of the … Therefore, there the net charge on the atom is zero. Structure of Atoms Class Nine Science Chapter 4 . On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom? Atom is made up of positive charge and electrons are embedded like plum pudding or watermelon model. Answer: (a) Rutherford concluded from the a-particle scattering experiment that: The negatively charged particles are embedded in the positively charged sphere. To understand atoms better, you can run through our detailed comparison of Thomson’s model, Rutherford’s model and Bohr’s model. c) Draw the Bohr model of atom Q Answer: a) b) Isotopes P, R. Structure of Atom Model Questions and Answers. The plum pudding model is one of the several historical scientific models of the atom. Ans: According to Thomson’s model, an atom is made up of positively charged sphere in which electrons are embedded. (ii) According to this model, hydrogen can give rise to only one spectral line, contrary to the observed fact of several lines. (b) In what way is the Rutherford’s atomic model different from that of Thomson’s atomic model? 3. Q8. So, the atom as a whole is electrically neutral. class-9-chemistry, ... On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. The plum pudding atomic theory assumed that the mass of an atom is uniformly distributed all over the atom. Characteristic features of Thomson model of an atom are: (i) An atom consists of a positively charged sphere and the electrons are embedded in it. Thomson’s model of an atom He proposed that: An atom consists of a uniform sphere of positive electricity in which the electrons are distributed more or less uniformly. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier. THOMSON’S MODEL OF THE ATOM. He does not explain the stability of an atom. • If failed to explain the results of experiments carried out by other scientists. Centre is positively charged. Thomson's model suggested that both positive and negative charges in an atom … It is a subatomic model of an atom. Rutherford’s model of an atom Rutherford observed that: Thomson’s model of an atom • Atom is electrically neutral consisting of positively charged sphere with electrons embedded in it. What is their significance? The … If an object moves in a circular path, the its motion is said to be accelerated. According to Thomson’s model, an atom consists of a positively charged sphere and the electrons are embedded in it like seeds in a watermelon. Answer:-According to Thomson’s model of an atom : (a) An atom consists of a positively charged sphere and the electrons are embedded like the seeds in a water-melon. Plum-Pudding Model Thomson proposed that the shape of an atom resembles that of a sphere having a radius of the order of 10-10 m. The plum pudding atomic theory assumed that the mass of an atom is uniformly distributed all over the atom. The negative and the positive charges are equal in magnitude because the atom has the same number of electrons and protons. Answer: Bohr’s model of atom: Electrons revolve round the nucleus in a fixed orbit. Ans: J.J. Thomson proposed that an atom consists of a spherical sphere (radius of about 10-10 m)in which the positive charges are uniformly distributed the electrons are embedded into it in such a manner so as to give stable electrostatic arrangement. Get the correct answers in TopperLearning’s NCERT Solutions for CBSE Class 9 Chemistry Chapter 4 Structure of the Atom. 4. Thomson’s model of an atom He proposed that: An atom consists of a uniform sphere of positive electricity in which the electrons are distributed more or less uniformly. https://classnotes.org.in/class-9/structure-of-an-atom/j-j-thomson-model-atom Solution: Thomson proposed a model of an atom. (ii) The negative and positive charges are equal in magnitude. Explain thomson's model of atom class- 9- chemistry- structure of the atom pls answer give reference to ncert textbook 2 See answers astha1917 astha1917 Thomson's model of atom. 3 Marks Questions. In the Rutherford’s model of an atom, the negatively charged electron revolves around the positively charged nucleus in circular path. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier. The major drawback of Rutherford model of atom is that it does not explain the stability of the atom. 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. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 9.. Thomson model Introduction. Question 2. Explain the structure of an atom on the basis of model proposed by J.J. Thomson. Thomson atom model . (b).Given: Mass no. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. Rutherford’s model could not explain this. of neutrons = 23 – 11 = 12 Atomic no. It has a negative charge of 1.602 × 10-19 C and a mass of 9.1085 × 10-31 kg at rest. Class IX - Chemistry - Structure of Atom - Test 2. Answer: According to Thomson’s model of an atom, an atom … Draw the sketch of: (A) Bohr ’s model of an atom. of protons = 11 No. SHORT ANSWER TYPE QUESTION (2 marks) Q. However, we know that the atom is stable and such a collapse does not occur. Important Solutions 1. 1. THOMSON’S MODEL OF THE ATOM Thomson’s model of an atom is also called the plum pudding model. • If failed to explain the results of experiments carried out by other scientists. Thomson’s model of atom failed to explain how a positive charge holds the negatively charged electrons in an atom. Thomson’s model of the atom is also known as the plum pudding model. The plum pudding atomic model was insufficient to explain the structure of an atom. According to J.J. Thomson, the electron is a constituent of all matter. Thomson's Atomic Model: According to Thomson's atomic model, an atom is made of positively charged substances in the form of a sphere. Answer: Bohr’s model of atom: Electrons revolve round the nucleus in a fixed orbit. Q11. According to Thomson's model of the atom : 1.An atom consists of a sphere (or ball) of positive charge with negatively charged electrons embedded in it. It also failed to explain an atom’s stability. What would be the observation if the α - particle scattering experiment is carried out using a foil of a metal other than gold? Solution: According to Thomson’s model of an atom: An atom consists of a positively charged sphere and the electrons are embedded like the seeds in a water-melon. of electrons = 11 Then, no. J.J Thomson Model. - Science. Answer: According to Thomson’s model of the atom, an atom consists of both negatively and positively charged particles. Multiple Choice Instructions 1 Mark for the Correct answer ... No charge . .. some of the drawbacks of thompson's model of atom were : (1)Since the weight of an electron is about a thousandth part of a hydrogen atom, it would mean that a single atom, especially of the heavier elements, would contain many thousand electrons. The negatively charged particles are embedded in the positively charged sphere These negative and positive charges are equal in magnitude. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. It tells us about different atomic particles. Drawback of Rutherford Model of an Atom. J.J. Thomson, in 1898, proposed the atomic model called Thomson's atomic model soon after the discovery of electrons. This means that electrons should eventually fall in the nucleus; leading to the collapse of the atom. It was unable to explain … These important extra questions are taken from NCERT Textbooks 2021-2022 only. The negative and the positive charge are equal in magnitude. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. There is no well defined definition of the structure of an atom. The theory did not mention anything about the nucleus of an atom. An atom is the smallest unit of ordinary matter that forms a chemical element.Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Whole mass of an atom is concentrated in the centre. An atom is made up of three particles, namely electrons, protons and neutrons. According to Thomson’s model, the atom is . Different models were proposed to explain the distribution of sub atomic particles in an atom. Thomson’s Model of an Atom. Class 9 Chemistry Structure of The Atom: Thomson’s Model of The Atom: Thomson’s Model of The Atom. Answer Thomson suggested that an atom is positively charged sphere of radius 10 -8 cm. The negative and positive charges present inside an atom are equal in magnitude. Question : On the basis of the Thomson’s model of an atom, explain how the atom is neutral as a whole. Let us discuss those various models to explain how these particles are arranged within the atom. ";s:7:"keyword";s:37:"explain thomson model of atom class 9";s:5:"links";s:722:"<a href="http://digiprint.coding.al/site/trwzrk/daniel-kessler-instagram">Daniel Kessler Instagram</a>,
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