So, the atom as a whole is electrically neutral. The negative and positive charges are equal in magnitude. Thomson proposed that: An atom consists of a positively charged sphere and the electrons are embedded in it. We can also think of a watermelon, the positive charge in the atom is spread all over like the red edible part of the watermelon, while the electrons are studded in the positively charged sphere, like the seeds in the watermelon. The electrons, in a sphere of positive charge. Thomson proposed the model of an atom to be similar to that of a Christmas pudding. Thomson (1856- 1940) was a British physicist, He was awarded the Nobel Prize in Physics for his work on the discovery of electrons. Thomson was the first one to propose a model for the structure of an atom. For explaining this, many scientists proposed various atomic models. It was then considered necessary to know how electrons and protons are arranged within an atom. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Dalton’s atomic theory. CBSE Case Study Questions Class 9 Science – Structure of the Atomĭalton’s atomic theory suggested that the atom was indivisible and indestructible. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks. In where some Questions will made on that respective Case Based Study. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Structure of the Atom.Īt Case Study Questions there will given a Paragraph. Important Case Study Questions for Class 9 Exam. Case Study Questions Class 9 Science Chapter 4 Structure of the AtomĬBSE Class 9 Case Study Questions Science Structure of the Atom.
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