This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 13 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Electrons have less mass than protons do A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Mass number of an atom is 27 and no.of neutrons is 14. What is the no. of protons? A) 14. B) 15. C) 17. D) 13. Show Answer Correct Answer: D) 13. 3. Atoms having same atomic number but different mass numbers are called A) Isotopes. B) Topes. C) Isobars. D) Both. Show Answer Correct Answer: A) Isotopes. 4. What is the nickname for Thomson's model? A) Plum pudding model. B) Electron cloud model. C) Billiard ball model. D) Nuclear model. Show Answer Correct Answer: A) Plum pudding model. 5. Which of the following correctly represents the electronic distribution in the Mg atom?(a) 3, 8, 1(b) 2, 8, 2(c) 1, 8, 3(d) 8, 2, 2 A) C. B) A. C) B. D) D. Show Answer Correct Answer: C) B. 6. Spin quantum number of the outermost electron of Al is ..... A) +1/2. B) -1. C) +1. D) -1/2. Show Answer Correct Answer: A) +1/2. 7. What is the mass number of an atom with 20 protons and 22 neutrons? A) 44. B) 22. C) 20. D) 42. Show Answer Correct Answer: A) 44. 8. A student is studying sodium, a highly reactive metal that humans need to regular water balance in their bodies. Which characteristic of sodium is most closely related to its chemical reactivity? A) The 1 valence electron in each atom of sodium. B) The 11 protons in each atom of sodium. C) The atomic mass of sodium, which is 22.990 amu. D) The density of sodium, which is 0.971 g/cm$^{3}$. Show Answer Correct Answer: A) The 1 valence electron in each atom of sodium. 9. 'All orbitals of equal energy are occupied by one electron before any single orbital is occupied by a second electron'. this is the statement for? A) Hund's rule. B) Aufbau principle. C) Core Notation. D) Pauli exclusion principle. Show Answer Correct Answer: A) Hund's rule. 10. What does an element's atomic number tell you? A) Number of protons. B) Number of neutrons. C) Number of electrons. D) None of the above. Show Answer Correct Answer: A) Number of protons. 11. Which particles are found in the cloud around the nucleus? A) Protons. B) Neutrons. C) Electrons. D) None of the above. Show Answer Correct Answer: C) Electrons. 12. Rutherford bombarded ..... particles in discovery of nucleus A) Alpha-rays. B) Gamma-rays. C) X-rays. D) Beta-rays. Show Answer Correct Answer: A) Alpha-rays. 13. In 1932 J. Chadwick discovered another sub-atomic particle which had no charge and a mass nearly equal to that of proton. It was eventually named as A) Neutron. B) Electron. C) Proton. D) $\alpha$-particle. Show Answer Correct Answer: A) Neutron. 14. This subatomic particle is inside the nucleus and has a charge. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: A) Proton. 15. Atomic number is number of proton in an atom A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. A subatomic particle that has the same mass as a proton but no electric charge A) Jimmy Neutron. B) Nuclear. C) Nucleus. D) Neutron. Show Answer Correct Answer: D) Neutron. 17. When an atom gains an electron, it A) Acquires a negative charge and becomes a negative ion. B) Acquires a positive charge and becomes a positive ion. C) Becomes electrically neutral. D) Always has an uneven number of valence electrons. Show Answer Correct Answer: A) Acquires a negative charge and becomes a negative ion. 18. The number of neutrons in the element $^{9}$$_{4}$Be is A) 5. B) 13. C) 9. D) 4. Show Answer Correct Answer: A) 5. 19. What is atomic number A) The number of neutrons. B) The number of protons. C) The number of proton and neutrons. D) The number of proton and electrons. Show Answer Correct Answer: B) The number of protons. 20. An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.Find average atomic mass. A) 53.45 amu. B) 17.33 amu. C) 52.19 amu. D) 51.99 amu. Show Answer Correct Answer: D) 51.99 amu. 21. There are ..... periods and ..... groups in the modern periodic table. A) 18 periods and 7 groups. B) 17 periods and 8 groups. C) 7 periods and 18 groups. D) 8 periods and 17 groups. Show Answer Correct Answer: C) 7 periods and 18 groups. 22. The 20th Element on the periodic table A) Sodium. B) Lithium. C) Calcium. D) Copper. Show Answer Correct Answer: C) Calcium. 23. Name the central part of an atom where protons and neutrons are held together. A) Proton. B) Nucleus. C) Neutron. D) Electron. Show Answer Correct Answer: B) Nucleus. 24. Ar is the symbol for the element ..... A) Arsenic. B) Archaeopteryx. C) Argentium. D) Argon. Show Answer Correct Answer: D) Argon. 25. Which of the following determines the identity of an element? A) Number of neutrons. B) Atomic mass. C) Number of protons. D) Number of shells. Show Answer Correct Answer: C) Number of protons. 26. According to J.J Thomson's atomic model, negative charges are embedded in A) A lump of positive charges. B) A lump of neutral charges. C) Nucleus. D) A lump of small atoms. Show Answer Correct Answer: A) A lump of positive charges. 27. Protons and neutrons are collectively called as ..... A) Molecules. B) Electrons. C) Nucleons. D) None of the above. Show Answer Correct Answer: C) Nucleons. 28. Which subatomic particles contribute the most to the mass of an atom? A) Protons, Neutrons, Electrons. B) Protons only. C) Protons and Electrons. D) Protons and Neutrons. Show Answer Correct Answer: D) Protons and Neutrons. 29. Found orbiting outside the nucleus, this subatomic particle has a negative charge. A) Idontknowatron. B) Electron. C) Proton. D) Neutron. Show Answer Correct Answer: B) Electron. 30. The frequency of violet light is 7.5x10$^{14 }$Hz. What is its wavelength? A) 4.0x10$^{7}$ m. B) 2.25x10$^{23}$m. C) 4.0x10$^{-7}$ m. D) 2.25x10$^{23}$ Hz. Show Answer Correct Answer: C) 4.0x10$^{-7}$ m. 31. Valency of oxygen is A) 3. B) 2. C) 1. D) 4. Show Answer Correct Answer: B) 2. 32. Identify an element with two shells and five electrons in the valence shell. A) Phosphorous. B) Nitrogen. C) Silicon. D) Oxygen. Show Answer Correct Answer: B) Nitrogen. 33. The only subatomic particle that carries a positive charge is the ..... A) Nucleus. B) Electron. C) Neutron. D) Proton. Show Answer Correct Answer: D) Proton. 34. The electronic configuration of an element is 2, 8, 5. What is its valency? A) 2. B) 1. C) 4. D) 3. Show Answer Correct Answer: D) 3. 35. The number of valence electrons in an element affects the reactivity of that element. Which element listed has the fewest valence electrons? A) Neon (Ne). B) Oxygen (O). C) Beryllium (Be). D) Sodium (Na). Show Answer Correct Answer: D) Sodium (Na). 36. The electrons present in the outermost shell are called A) Valence electrons. B) Octet electrons. C) Duplet electrons. D) Valency electrons. Show Answer Correct Answer: A) Valence electrons. 37. On moving down the group, the shielding effect A) Increases. B) Decreases. C) Remains the same. D) None of these. Show Answer Correct Answer: A) Increases. 38. An element has the mass number 12 and atomic number 6. What is the number of neutron A) 4. B) 6. C) 8. D) 10. Show Answer Correct Answer: B) 6. 39. A calcium ion has 20 neutrons, 20 protons, and 18 electrons. What is the ion's charge? A) 2+. B) 1-. C) 1+. D) 2-. Show Answer Correct Answer: A) 2+. 40. How many electrons in an atom can have n + l = 5 A) 54. B) 18. C) 36. D) 6. Show Answer Correct Answer: B) 18. 41. How many electrons total are found in the f orbital? A) 14. B) 2. C) 6. D) 10. Show Answer Correct Answer: A) 14. 42. Violet light has graeter ..... than red light? A) Frequency. B) Velocity. C) Density. D) Wavelength. Show Answer Correct Answer: A) Frequency. 43. If ionising energy of H atom is 13.6 eV, then the second ionising energy of He should be A) 27.2 e V. B) Cannot be predicted. C) 54.4 e V. D) 13.6 e V. Show Answer Correct Answer: C) 54.4 e V. 44. Which of the following is not a feature of a chemical reaction? A) Evolution of gas. B) Occurrence of rain. C) Absorption of heat. D) None of the above. Show Answer Correct Answer: B) Occurrence of rain. 45. Most of the $\alpha$-particles passed through the gold foil without getting deflected, this shows that (select the most appropriate one) A) Most of the space inside the atom is empty. B) The positive charge of the atom occupies very little space. C) All the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. D) None. Show Answer Correct Answer: A) Most of the space inside the atom is empty. 46. .Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus? A) $^{99}$Ba$_{56}$. B) $^{43}$Ba$_{56}$. C) $^{56}$Tc$_{43}$. D) $^{99}$Tc$_{43}$. Show Answer Correct Answer: D) $^{99}$Tc$_{43}$. 47. The following quantum number are possible for how many orbitals? n = 4, l = 1, m = +2 A) 6. B) 2. C) 1. D) 3. Show Answer Correct Answer: C) 1. 48. Which of the following elements is Paramagnetic? A) S. B) Q. C) R. D) P. Show Answer Correct Answer: D) P. 49. The smallest particle with characteristics of an element is known as the A) Atom. B) Electron. C) Periodic Table. D) Proton. Show Answer Correct Answer: A) Atom. 50. Elements are defined by the number of ..... they possess. A) Particles. B) Protons. C) Electrons. D) Neutrons. Show Answer Correct Answer: B) Protons. 51. Atoms of the same element that have different numbers of electrons A) Nucleus. B) Isotope. C) Ion. D) Electron cloud. Show Answer Correct Answer: C) Ion. 52. 1) The radii of Bohr orbit are directly proportional to ..... A) Cube of principal quantum number. B) Independent of principal quantum number. C) Square of principal quantum number. D) Principal quantum number. Show Answer Correct Answer: C) Square of principal quantum number. 53. The wave number of the first emission line in the H atom spectrum in the Balmer series in terms of Rydberg's constant (R) is given by A) $\frac{7R}{144}cm^{-1}$. B) $\frac{5R}{36}cm^{-1}$. C) $\frac{3R}{4}cm^{-1}$. D) $\frac{9R}{400}cm^{-1}$. Show Answer Correct Answer: B) $\frac{5R}{36}cm^{-1}$. 54. Which lines lie in visible region? A) Paschen. B) Balmer. C) Lyman. D) Pfund. Show Answer Correct Answer: B) Balmer. 55. How many electrons are in an atom with an atomic number of 50? A) 5. B) 8. C) 50. D) 2. Show Answer Correct Answer: C) 50. 56. Which of the following atoms would have a charge of 1? A) An atom with 9 protons, 9 electrons, and 9 neutrons. B) An atom with 7 protons, 11 electrons, and 8 neutrons. C) An atom with 5 protons, 5 electrons, and 4 neutrons. D) An atom with 6 protons, 5 electrons, and 7 neutrons. Show Answer Correct Answer: D) An atom with 6 protons, 5 electrons, and 7 neutrons. 57. The orbital with n =3, l = 1 is designated by A) 3d. B) 3f. C) 3p. D) 3s. Show Answer Correct Answer: C) 3p. 58. If the atom has 25 electrons, how many protons does it need to have to be neutral? A) 25 protons. B) It doesn't need protons. C) 5 protons. D) 15 protons. Show Answer Correct Answer: A) 25 protons. 59. The principle quantum number, n, represents the: A) Magnetic value. B) Spin value. C) Energy level. D) Suborbital value. Show Answer Correct Answer: C) Energy level. 60. What is the symbol of sodium? A) So. B) Na. C) S. D) NA. Show Answer Correct Answer: B) Na. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 1Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 2Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 3Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 4Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 5Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 6Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 7Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books