chapter 4 the structure of the atom answers

Answer: The atom will be electrically neutral as one – ve charge balances one + ve charge. Here we have given Class 9 NCERT Science Text book Solutions for Chapter 4 Structure of Atom. (2) Chemical properties of the isotopes are same due to same number of electrons. This is just one of the solutions for you to be successful. (1) Atom has nucleus in the centre. These questions are quite useful to prepare the objective type questions that will appear in the Class 9 Science Question Paper in the Annual Examination 2020. Therefore, the atom does not possess any charge. The isotope used to remove the brain tumours and treatment of cancer is Learn vocabulary, terms, and more with flashcards, games, and other study tools. 7. On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom? 1. (c) 11 electrons and 12 neutrons (d) 12 electrons and 11 neutrons 4.1 defining the atom 4.2 structure of the nuclear atom 4.3 distinguishing. 18. Mass number — Gives the number of protons and neutrons (A) Define atomic number. An answer key is provi. Question 2. i.e., Valency of oxygen = 2 Hence, Answer: Protons are heavy with mass 1 unit and hence are concentrated in the centre Fuel for nuclear reactors is derived from the isotopes of the Uranium atom. Answer: According to Rutherford’s model of an atom the electrons are revolving in a circular orbit around the nucleus. (d) 4 positive charge and 4 mass unit Hence it has completely filled K and L shells. NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom Exercise and Intext question answers in PDF format to free download. Chapter 4 Atomic Structure 4.1 Defining the Atom - ppt download #363897 Chapter 4 Atomic Structure Wordwise Worksheet - Livinghealthybulletin #363898 Chapter 4 atomic Structure Workbook Answers … In the structure of an atom why are protons present in the centre and are not pulled outside by the electrons as both are oppositely charged with same unit of charge? (iii) Electrons are not accommodated in a given shell unless the inner shells are filled. Valence electrons are 7, hence chlorine gains one electron for the formation of Cl–. i. Question 3. If an atom contains one electron and one proton, will it carry any charge or not? (b) The element X’ is boron. Contrast the methods used by the Greek philos-ophers and Dalton to study the atom. What are the limitations of Rutherford’s model of the atom? Question 1. Answer: Question 2. ∵ n = orbit number i.e., 1, 2, 3 Question 5. NCERT Textbook for Class 9 Science – Page 47 Conclusion from observation: Answer: Three atomic species of hydrogen are: Question 11. It is advised for the students to get acquainted with this NCERT Exemplar in order to lay a … Which one of the following is a correct electronic configuration of Sodium? The isobars among the following is What is an octate? Formulae Handbook for Class 9 Maths and ScienceEducational Loans in India. 1. (iv) Isobars: Isobars are atoms which have the same mass number but differ in the atomic number. Aryan could not solve the following question in the group; his group mate explained him and solved his difficulty. Because it will gain 1 electron to complete its octate. Greek philosophers could not conduct The valency is 3. NCERT Solutions for Class 9 Science Chapter 4 Structure of The Atom at BYJU’S provides students with solutions to all the questions provided in the NCERT Solutions for Class 9 textbook, which is on the lines of CBSE board. (3) A very small fraction of a-particles are deflected by 180°, this shows that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. (ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8. 19. Answer: A helium atom has two neutrons. They are isotopes as they differ in the number of neutrons and hence their mass numbers. For each statement below, write true or false. Question 2. 14. (ii) The negative and positive charges are equal in magnitude. Therefore,it is neutral. Answer: The rules for writing of distribution of electrons in various shells for the first eighteen elements are: Therefore its valency is -2, i.e., two electrons lesser. Can the value of ‘Z’ be same for two different atoms? Answer: Protons were discovered by E. Goldstein in 1866 and neutrons were discovered by J, Chadwick in 1932. 3. This solution contains questions, answers, images, step by step explanations of the complete Chapter 4 titled Structure of the Atom of Science taught in class 9. Science NCERT Grade 9, Chapter 4, Structure of the Atom is a continuation of the previous chapter with a focus on different subatomic particles and the various models that have been proposed to explain how these particles are arranged within the atom. Answer: According to J.J. Thomson’s model of an atom, the electrons are embedded all over in the positively charged spheres. (a) 2, 8 (b) 8, 2, 1 https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4 3. Question 15. Question 2. Distribution of electrons in Carbon atoms: Number of electrons is equal to the number of protons in carbon atom i.e., 6, The distribution of electrons in carbon atom is K – 2, L – 4. Question 1. (ii) Electrons and protons are equal in magnitude, hence an atom on the whole is electrically neutral. Then why is it wrong to say that atomic number of an atom is equal to its number of electrons. (a) U-235 (b) Na-24 Give the names of three atomic species of hydrogen. (c) one electron and two neutron (d) one proton and one neutron Why is atom electrically neutral? The whole unit of Matter makes up for 23 marks out of which Structure of the atom chapter is allocated 10 marks. Structure of the Atom Class 9 Extra Questions Very Short Answer Questions. ANSWER:-The valency of an element is determined by the number of valence electrons present in the atom of that element. ● The nucleus is at the centre and is positively charged holding the entire mass. AZX What does this symbol represent? Question 4. This chapter has a good weightage. Question 10. Answer: Bohr’s model of an atom is the best model and is correct because it gives the explanation of nucleons (protons and neutrons) in the centre and how electrons revolve around the nucleons in their discrete, special orbits, so electrons don’t loose/radiate energy and remain bonded in their shell. To understand atoms better, you can run through our detailed comparison of Thomson’s model, Rutherford’s model and Bohr’s model. To fill the orbit, 2 electrons are required. (ii) What is the charge on the atom? Hence, when both the shells are full, the total number of electrons present in the atom = 2+8 = 10 electrons. What did Thomson’s proposed model of an atom consist of? It also sheds light upon concepts such as valency, atomic number and mass number, which are essential to identify elements and their behavioural properties. Answer: Question 4. Describe Bohr’s model of the atom. Answer: Activity. As per Rutherford’s model of an atom, the positively charged protons are the ones that are present in the atom. 4.4 The Bohr Model of the Hydrogen Atom; Sommerfeld - fine structure constant 4.5.1 Successes 4.5.2 Failures 4.6 Shell structure of atoms, characteristic X-Ray Spectra, Moseley’s fit and it’s support of Bohr’s model 4.7. ∴ p + n = 27 p = 13, (Atomic No. While preparation of NCERT Solutions, the answering method that is promoted by the CBSE and hence the allotment of marks in examinations is taken into consideration for students to lay out their answers correspondingly and hence to score maximum marks. No. What are valence electrons? ●Electrons are negatively charged and scattered all through the inside of the sphere. Answer: Mass of an atom is concentrated in nucleus. The elements with same valence electrons and form same type of ions Answer: Atomic number = 12 (3) Iodine isotope is used in the treatment of goitre. They also associated properties with each of the four basic compo-nents of matter. The experts have prepared these solutions to help students with their annual exam preparation. As the atomic number is same i.e., = 6. State its characteristics, give uses of isotopes?

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