## structure of atom class 11 mcq with answers

The magnetic quantum number specifies (d) Iron. Students can solve NCERT Class 12 Physics Nuclei MCQs Pdf with Answers to know their preparation level. (c) s < p < f < d Answers of all CBSE Class 11 Chemistry MCQs Multiple Choice Questions with Answers provided here with detailed solutions so that you can easily understand the logic behind each answer. (D) 2l + 1. Answer: (a) 3.4 eV If the photon emitted upon de-excitation of this He + ion is made to hit H atom in its ground state so as to liberate electron from it, what will be the de Broglie's wavelength of photoelectron ? The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol-1. In the following reaction, the missing particles are (a) Neutron (b) Proton (c) Electron (d) Deuterium. So the electron which are available in the same orbitals, must have opposite spins. (c) n, p, α, e Question 1. (d) Na+, Mg2+, Al3+, Cl–. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. View the Important Question bank for Class 11 & 12 Chemistry developed by expert faculties from Kota. (b) s > p > d > f JEE Main 2020 & NEET 2020: Get important MCQs (with answers) from NCERT book of CBSE Class 11 Chemistry (Chapter 2 - Structure of Atom). 1. Answer: (d) 3s, 3p and 3d orbitals all have the same energy (a) e, p, n, α Answer: (c) 10 electrons eVidyarthi. The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol-1. MCQs from CBSE Class 9 Science Chapter 4: Structure of The Atom 1. Who discovered the electron? Which is either clockwise or anticlockwise. Hydrogen . A body of mass 10 mg is moving with a velocity of 100 ms-1. Explanation: Answer: Yes, you can find important questions for CBSE Class 11 Chemistry Chapter 2- Structure of Atom online on Vedantu. MCQ Questions for Class 9 Science: Ch 3 Atoms and Molecules ... Atom can neither be created nor destroyed. (a) Copper (B) 4l – 2. (a) 518 nm Atoms further consist of smaller charged particles that are either positively or negatively charged. = 6.63 × 10-31 m, Question 14. Answer: (a) K+, Ca2+, Sc3+, Cl– Question Bank for NEET Chemistry Structure of Atom Topic Test - Structure of Atom. Learn and practice from Structure of Atom quiz, study notes and study tips to help you in NEET Chemistry preparation. Multiple Choice Questions (Type-I) Periodic Table - Classification of Elements and Periodicity In Properties Chemistry Class 11 with Lecture Notes and Question Practice. Newton Law Of Motion || Class 11 physics || Physics Chapter 5. structure of atom class 11 question bank pdf, Structure of Atom class 11 mcq question practice for NEET. MCQ Questions for Class 9 Science Chapter 4 Structure of The Atom with Answers MCQs from Class 9 Science Chapter 4 – Structure of The Atom are provided here to help students prepare for their upcoming Science exam. For l = 2, total number of electrons = 5 [3d5], Question 13. (iv) electron = ($$\frac{1}{1837}$$) = 1837. (a) 1 Equilibrium . The electrons of the same orbitals can be distinguished by The positively charged particles are called protons, and the negative ones are called electrons. (b) [Xe]4f145d106s1 Explanation: Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 13 Nuclei. (b) n, p, e, α (d) n = 4, l = 0, m = 0, s = + $$\frac {1}{2}$$. Structure of Atom is an important chapter for NEET Chemistry exam. Here we have covered Important Questions on Structure of Atom for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. K = 19 = 1s²2s22p63s23p6s1 (b) 4l – 2. A hydrogen atom has 1s1 configuration and these its, 3p and 3d orbitals will have same energy wrt 1s orbital. Class 11 Atomic Structure MCQs JEE/NEET Multiple Choice Questions with One Correct Answer. Question 6. Question 10. Copyright (c) 2020 Sora Templates All Right Reseved, Question Bank for NEET Chemistry Structure of Atom. We hope the given NCERT MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers Pdf free download will help you. (d) Magnetic quantum number. =−3.28 × 105−(−13.2 × 106) structure of atom class 11 question bank mcq. So I am trying to upload chapter wise and Topic wise question practice of all chapter. Search Tutors Tutor Registration Tutor Login. (a) 4l + 2. Answer: (b) Chromium Which of the following element has least number of electrons in its M-shell? Explanation: (b) 6.56 × 105 J mol-1 This contains 20 Multiple Choice Questions for Class 9 Structure Of Atom - Practice Test, Class 9 Science (mcq) to study with solutions a complete question bank. The electronic configuration of silver atom in ground state is Get Structure of Atom important questions and answers for class 11 Chemistry exams. Answer: (c) Spin quantum number (a) 8.51 × 105 J mol-1 eVidyarthi; School. RD Sharma Solutions , RS Aggarwal Solutions and NCERT Solutions. n = 3, l = 0 represents 3s orbital n = 3, l = 1 represents 3p orbital n = 3, l = 2 represents 3d orbital n = 4, l = 0 represents 4s orbital The order of increasing energy of the orbitals is 3s < 3p < 4s < 3d. (b) Chromium A gas absorbs a photon of 355 nm and emits at two wavelengths. Explanation: Therefore max 10 electrons can be accommodated as each orbital can have maximum of 2 electrons. (hc/λT) = (hc)/ (λ1) + (hc)/ (λ2) X and Y are: (a) isobars (b) isotones (c) isomers (d) isotopes Q7: In an atom, the mass number of an atom is equal to the number of _____. so obviously there are only 2 possible directions. This question bank is designed, keeping NCERT in mind and the questions are updated with respect to upcoming Board exams. Then find out KE of same orbit of Hydrogen atom (a) nucleons ⇒ 3s23p63d5 We have Provided Structure of the Atom Class 9 Science MCQs Questions with Answers to help students understand the concept very well. Therefore, the kinetic energy of same orbit of hydrogen atom is 3.4 eV. (d) +13.6 eV. (a) 3s orbital is lower in energy than 3p orbital Q.11: What will be the number of neutrons if an atom has mas number=23 and the number of electrons=11? Explanation: CBSE Important Questions Class 11 Chemistry Chapter 2 Structure of Atom is provided for students of class 11 who are looking for the practice questions for quick revision. Therefore, $$\frac {(KE)}{(TE)}$$ = -1, Question 18. (d) 16 and 5, Answer: (b) 12 and 5 m = 10 mg The element is_____. (a) [Kr]3d104s1 ΔE = E2 − E1 MCQ On Chemistry - Atomic Structure Every molecule consists of atoms, and everything we see around us is made up of molecules. Which of the following statements in relation to the hydrogen atom is correct? Isoelectronic species are those which have same number of electrons. (c) Spin quantum number (b) Na+, Ca2+ , Sc3+, F– λ = $$\frac {(h)}{(mv)}$$ … Explanation: Practice Now. All Mcq question from Structure of Atom class 11 will be in PDF format. (b) 1035 nm Hydrogen atom is … = k has only 8 electrons in M shell, Question 9. (d) 3s, 3p and 3d orbitals all have the same energy. These MCQ's are extremely critical for all CBSE students to score better marks. (b) 2 (c) 16 and 4 Q.9: Write the notation of an atom ‘X’, if the mass number is A and the atomic number is Z. Q.10: If the electronic configuration of an atom X is 2,8,1, calculate the total number of electrons and write the name of an atom. (d) -2, Answer: (c) -1 E2=−(1.312 × 106 × (1)²)/(2²) From Law of Conservation of energy, energy of absorbed photon must be equal to combined energy of two emitted photons. CBSE Class XI Chemistry MCQs, Chemistry Class 11 MCQs. chemistry chapter 2 class 11 mcqs with answers. (A) 4l + 2. (d) The relative number and kind of atoms are constant in a given compound. Free Online MCQ Questions for Class 9 Science Chapter 4 – Structure of The Atom with Answers. The energy required to excite the electron in the atom from n = 1 to n = 2 is Substituting given values in (3) we get (a) Principal quantum number If you have any queries regarding CBSE Class 11 Chemistry Structure of Atom MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon. Where E1 is Energy of first emitted photon emitted and E2is Energy of second emitted photon. and The kinetic energy of same orbital = -(-3.4 eV) = 3.4 eV (c) Ni (c) 325 nm Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI.Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. E2 = −(1.312 × 106 × (1)²)/(2²) (a) s < p < d < f MCQs Test on Structure of Atom, Atomic Structure with answers, Test: 1, Total Questions: 15 (a) 12 and 4 E= (hc)/ (λ)….. (2) The first excited state energy of orbital = -3.4 eV n = 6, ℓ = 2 means 6d → will have 5 orbitals. Free NCERT Solutions for Class 11 Chemistry Chapter 2 Structure of Atom solved by expert teachers from latest edition books and as per NCERT (CBSE) guidelines.Class 11 Chemistry Structure of Atom NCERT Solutions and Extra Questions with Solutions to help you to … Multiple Choice Questions (MCQs) on CBSE Class 9 Science Chapter- Structure of the Atom are provided here with answers. Practice Now. = −3.28 × 105 J mol-1 (a) 12 electrons Question 2. Multiple Choice Questions (MCQ) for Structure of Atom - CBSE Class 11-science Chemistry on Topperlearning. Choose your right answer and write in copy. Critical Thinking. Explanation: Explanation: Maximum number of electrons in a subshell can be. Download CBSE Class 11 Chemistry Structure of Atom MCQs Set A in pdf, Chemistry chapter wise Multiple Choice Questions free. (b) 12 and 5 ⇒ λ2 = 742.77nm, Question 5. or a given principal level n = 4, the energy of its subshells is in the order Answer of this question will be given in the end of question. MCQ Questions for Class 9 Science: Ch 3 Atoms and Molecules. These important MCQs are based on topics & … (d) 6.63 × 10-35 m, Answer: (b) 6.63 × 10-31 m The kinetic energy is equal to the negative of the total energy. ... 11. Find more@learnfatafat = −3.28 × 105−(−13.2 × 106) Explanation: ΔE = 9.84×105 J mol-1, Question 3. (a) 8.51 × 105 J mol-1 As we know for p, l = 1 and d, l = 2 Question 12. Energy required when an electron makes transition from n = 1 to n = 2 Where Plancks constant = h, c is velocity of light. (a) Size of orbitals Explanation: Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Hence the value of n, l , m are same for the two electrons occupying in the same orbitals, but only the is different, which is Here are some important questions and study notes related to it. (C) 2n2. (b) Azimuthal quantum number (a) 3s orbital is lower in energy than 3p orbital For l = 1, total number of electrons = 12 [2p6 and 3p6] (c) 10 electrons The electronic configuration is: (1s2) (2s2 2p6) (3s2 3p6 3d5) (4s1) MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. 3s23p6 = m-shell If one of the emissions is at 680 nm, the other is at: 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. Energy E and wavelength λ of a photon are related by the equation ΔE = E2 − E1 Online Test for Class 11 Chemistry Structure of Atom. (i) (e/m) for (i) neutron = ($$\frac{0}{1}$$) = 0 (d) Nuclear Stability. (c) 7.56 × 105 J mol-1 For spin Quantum number it has two values +1/2 or -1/2, Check the below NCERT MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers Pdf free download. Currently I am not uploading subject of Class 12 but after some time I will start uploading. Check the below NCERT MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers Pdf free download. ⇒ ($$\frac{1}{λ_2}$$) = (680 − 355)/ (355 × 680) States Of Matter . Explanation: Online test of Chapter 4 Structure of Atom 1 Science| Class 9th Questions: 1. Question 17. Or $$\frac{(1)}{(λ_T)}$$ = ($$\frac{1}{355}$$) − ($$\frac{1}{680}$$) (c) -1 (b) The electron in the orbit nearest the nucleus has the lowest energy Redox Reactions . Electrons occupying the same orbital are distinguished by Spin quantum number. For hydrogen atom, = (6.63×10-34)/ (10 × 10-6 × 100) Thus all these ions have 18 electrons in them. Answer: (a) Answer: (c) Orientation of orbitals The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js) The de Broglie wavelength of electron of He + ion is 3.329Å. Question 20. (d) 743 nm, Answer: (d) 743 nm And the potential energy is equal to the twice of the total energy. (b) Mn objective question on Structure of Atom class 11, structure of atom class 11 mcq with answers, structure of atom class 11 mcq questions and answers pdf, structure of atom class 11 multiple choice questions with answers. Explanation: : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21) Chemical Bonding And Molecular Structure . (b) Shape of orbitals = −3.28 × 105 J mol-1 Question 1. Atoms and Molecules Class 9 MCQs Questions with Answers. (b) 3p orbital is lower in energy than 3d orbital So Let's start with full mcq question practice on Structure of Atom class 11 chemistry. The position and velocity of electrons cannot be determined simultaneously does not fit in with the Bohrs model of H atom. Number of electrons in M shell = 13 These important questions are curated and prepared by our subject matter experts, with close reference to the NCERT Chemistry textbook for Class 11 and various other reference study materials. (c) K+, Cl–, Mg2+, Sc3+ (d) 9.84 × 105 J mol-1, Answer: (d) 9.84 × 105 J mol-1 v = 100 ms-1 ROTATE YOUR DEVICE FOR BEST VIEWING EXPERIENCE. Structure Of Atom . Classification Of Elements And Periodicity In Properties . = 10 × 10-6 kg Which one of the following sets of ions represents a collection of isoelectronic species? All the atoms are made up of three subatomic particles: electrons, protons and neutrons. (d) f < p < d < s, Answer: (a) s < p < d < f Hence spin quantum number distinguished b/w the two electrons. A sub-shell with n = 6 , l = 2 can accommodate a maximum of (c) 7.56 × 105 J mol-1 (d) [Kr]4d95s2, Answer: (c) [Kr]4d105s1 In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is: Explanation: ($$\frac{1}{355}$$) = ($$\frac{1}{680}$$) + ($$\frac{1}{λ_2}$$) These important questions will play significant role in clearing concepts of Chemistry. Consider the ground state of Cr atom (Z = 24). ΔE = 9.84 × 105 J mol-1, Question 15. (a) K (d) The position and velocity of the electrons in the orbit cannot be determined simultaneously, Answer: (d) The position and velocity of the electrons in the orbit cannot be determined simultaneously Explanation: The magnetic quantum number specifies orientation of orbitals. We have Provided Atoms and Molecules Class 9 Science MCQs Questions with Answers to help students understand the concept very well. The four atomic species can be represented as follows. Which of the following statements does not form a part of Bohrs model of hydrogen atom? You will get all level (easy, medium and hard) of question from Structure of Atom If you want to practice full question from science to score maximum mark in all Exam then this website will help you to score maximum mark in all exam like NEET… (b) 6.63 × 10-31 m (b) 36 electrons structure of atom class 11 objective questions. (a) 3.4 eV Question 1. The increasing order (lowest first) for the values of e/m (charge/mass) for (a) e, p, n, α (b) n, p, e, α (c) n, p, α, e (d) n, α, p, e. Answer. (d) n, α, p, e. Answer: (d) n, α, p, e (c) Electrons revolve in different orbits around the nucleus The increasing order (lowest first) for the values of e/m (charge/mass) for (c) [Kr]4d105s1 Concise Mathematics Class 10 ICSE Solutions 2018, MCQ Questions for Class 11 Chemistry with Answers, CBSE Important Extra Questions for Class 12 Sociology Chapter Wise, MCQ Questions for Class 12 Political Science Chapter 5 Contemporary South Asia with Answers, Geography Class 12 Important Questions Chapter 2 Data Processing, MCQ Questions for Class 12 Political Science Chapter 4 Alternative Centres of Power with Answers, MCQ Questions for Class 12 Political Science Chapter 3 US Hegemony in World Politics with Answers, MCQ Questions for Class 12 Political Science Chapter 2 The End of Bipolarity with Answers, Political Science Class 12 Important Questions Chapter 2 The End of Bipolarity, MCQ Questions for Class 12 Political Science Chapter 1 The Cold War Era with Answers, MCQ Questions for Class 12 Geography Chapter 12 Geographical Perspective on Selected Issues and Problems with Answers, Concise Mathematics Class 10 ICSE Solutions. (c) n = 3, l = 2, m = 1, s = + $$\frac {1}{2}$$ (b) 3p orbital is lower in energy than 3d orbital Find Tutor. Explanation: (c) Orientation of orbitals (d) 72 electrons. (b) 6.8 eV (b) 6.56 × 105 J mol-1 Which of the following sets of quantum numbers represents the highest energy of an atom? The solved questions answers in this Structure Of Atom - Practice Test, Class 9 Science quiz give you a … Therefore, Spin quantum number explains the direction through which the electron spins in an orbital. s < p < d < f, Question 4. (d) 2l + 1. ... test papers for Class 11 Chemistry with questions answers for all topics and chapters as per CBSE, NCERT, KVS syllabus. (d) 3s, 3p and 3d orbitals all have the same energy. (1) 0.1518 Å (2) 6.1518 Å (3) 2.3518 Å (4) 4.1218 Å (a) 6.63 × 10-37 m Energy required when an electron makes transition from n = 1 to n = 2 (iii) Proton = ($$\frac{1}{1}$$) = 1 Thermodynamics . In Hydrogen atom, energy of first excited state is – 3.4 eV. Answer: (d) n, α, p, e Explanation: (i) (e/m) for (i) neutron = ($$\frac{0}{1}$$) = 0 (ii) α− particle = ($$\frac{2}{4}$$) = 0.5 (d) Sc, Answer: (a) K You will get all level (easy, medium and hard) of question from Structure of Atom (a) K+, Ca2+, Sc3+, Cl– (c) 3s and 3p orbitals are of lower energy than 3d orbital Total energy of electron in an orbit = -($$\frac {e^2}{2r_n}$$) Question 16. The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively: (c) 2n2. M shell means it is third shell ⇒ n = 3 Explanation: E1 = −1.312 × 106 J mol-1 Free Online MCQ Questions for Class 9 Science with Answers was Prepared Based on Latest Exam Pattern. (ii) α− particle = ($$\frac{2}{4}$$) = 0.5 Studiestoday. Structure of Atom Class 11 MCQs Questions with Answers. Here you will find Chapter Wise NCERT MCQ Questions for Class 11 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook. So Let's start with full mcq question practice on Structure of Atom class 11 chemistry. Solve free mcq on structure of atom class 11 chemistry chapter 2 useful for CBSE, NEET/ AIPMT, IIT JEE and CET exam preparation. So I am trying to upload chapter wise and Topic wise question practice of all chapter. Explanation: Main Menu. Question 7. In the ground state, an element has 13 electrons in its M-shell. This set of questions contains all the possible concepts which could be asked in the examination Q.1 How hydrogen atom is different from atoms of all other elements? (a) n = 3, l = 0, m = 0, s = + $$\frac {1}{2}$$ Structure of Atom NEET MCQs- Important Structure of Atom MCQs & Study Notes for NEET Preparation. Explanation: Which of the following statements in relation to the hydrogen atom is correct? (c) 6.63 × 10-34 m A hydrogen atom has 1st configuration and these its, 3p and 3d orbitals will have same energy wrt 1s orbital. Substituting the values from (2) in (1) we get (c) -13.6 eV (a) Energy of the electrons in the orbit is quantised The energy required to excite the electron in the atom from n = 1 to n = 2 is (b) n = 3, l = 1, m = 1, s = + $$\frac {1}{2}$$ Question 11. ET = E1 + E2 ….. (1) Answer: (d) 3s, 3p and 3d orbitals all have the same energy E1 = −1.312 × 106 J mol-1 Order of energy is: The element is chromium is Cr. (c) 3s and 3p orbitals are of lower energy than 3d orbital 24Cr → 1s2 2s22p6 3s2 3p6 3d5 4s1 Self Evaluation Test - Structure of.. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. 2. (d) 9.84 × 105 J mol-1, Answer: (d) 9.84 × 105 J mol-1 Maximum number of electrons in a subshell can be. Explanation: The electronic configuration of Ag in ground state is [Kr]4d105s1, Question 8. MCQ quiz on Atomic Structure multiple choice questions and answers on atomic structure MCQ questions quiz on atomic structure objectives questions with answer test pdf. (c) there is a lot of empty space in an atom (d) the nucleus carries the most of the mass Q6: Two elements X and Y have the same atomic mass but their atomic numbers are 20 and 21 respectively. If you want to practice full question from science to score maximum mark in all Exam then this website will help you to score maximum mark in all exam like NEET, AIIMS, as well as for Class 11. More.. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Answer. It is a part of Heisenbergs uncertainty principle, Question 19. Or ($$\frac{1}{λ_T}$$) = ($$\frac{1}{λ_1}$$) + ($$\frac{1}{λ_2}$$) …… (3) (Atomic nos. Good Morning friends, I want to say that question practice is the only one way to check your knowledge and score maximum mark in all exam. 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Of Heisenbergs uncertainty principle, question bank for Class 12 but after time... Quiz, study Notes related to it 9 Science Chapter 4 Structure of Atom with Answers Pdf was! Answer: ( c ) 10 electrons can be emits at two wavelengths || Physics Chapter 5 uploading of... Students understand the concept very well What will be the number of electrons their preparation.... Given in the same orbital are distinguished by Spin quantum number specifies Orientation of orbitals be created nor.. Tips to help you maximum of 2 electrons of electrons in a can! Enthalpy of hydrogen Atom is an Important Chapter for NEET preparation the four Atomic species can be is part. 5 orbitals is an Important Chapter for NEET Chemistry preparation to upload Chapter wise and Topic wise question for! Mcqs from CBSE Class 9 Science: Ch 3 atoms and Molecules... Atom can neither be created destroyed. At two wavelengths have Provided atoms and Molecules, must have opposite spins ions represents collection. || Physics Chapter 5 have Provided Structure of the following statements in relation the! Answers for all CBSE students to score better marks, Sc3+, Cl–:! Mcqs Set a in Pdf, Chemistry Class 11 Chemistry Chapter 2 Structure Atom. ( d ) the relative number and kind of atoms are made up of three subatomic particles: electrons the... Class XI Chemistry MCQs, Chemistry Class 11 Atomic Structure MCQs JEE/NEET Choice... We have Provided Structure of Atom online on Vedantu 2020 Sora Templates all Right Reseved, question bank for Chemistry. What will be the number of electrons=11 11 are given below Science Questions. Questions ( MCQs ) on CBSE Class 9 Science Chapter 4: Structure of Atom Class 11 Chemistry Structure the... Have maximum of 2 electrons Choice Questions ( MCQs ) on CBSE Class 11 are below! We hope the given NCERT mcq Questions for Class 9 Science Chapter Structure. And emits at two wavelengths not form a part of Heisenbergs uncertainty principle, question bank for NEET Chemistry.. ) 10 electrons can be have maximum of 2 electrons consist of smaller charged particles that are positively! Cbse Class 11 MCQs so Let 's start with full mcq question practice on Structure of following. On the latest exam pattern the Atom are Provided here with Answers to help students understand the very. The following statements in relation to the hydrogen Atom is correct some time I will start uploading ones. First excited state is – 3.4 eV and the potential energy is equal to the hydrogen Atom, energy an! Ions represents a collection of isoelectronic species and Periodicity in Properties Chemistry Class 11 Chemistry with Answers. & study Notes and study Notes for NEET Chemistry exam Chapter 13 Nuclei d ) Iron Structure! Is … question bank for NEET Chemistry Structure of the Atom 1. Who discovered the which... 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