This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Spin quantum number of the outermost electron of Al is ..... A) +1/2. B) -1/2. C) +1. D) -1. Show Answer Correct Answer: A) +1/2. 2. What is the mass number of an atom with 20 protons and 22 neutrons? A) 20. B) 22. C) 42. D) 44. Show Answer Correct Answer: D) 44. 3. 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 11 protons in each atom of sodium. B) The density of sodium, which is 0.971 g/cm$^{3}$. C) The atomic mass of sodium, which is 22.990 amu. D) The 1 valence electron in each atom of sodium. Show Answer Correct Answer: D) The 1 valence electron in each atom of sodium. 4. '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) Aufbau principle. B) Pauli exclusion principle. C) Hund's rule. D) Core Notation. Show Answer Correct Answer: C) Hund's rule. 5. 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. 6. 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. 7. Rutherford bombarded ..... particles in discovery of nucleus A) Gamma-rays. B) Alpha-rays. C) Beta-rays. D) X-rays. Show Answer Correct Answer: B) Alpha-rays. 8. 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) Proton. B) Neutron. C) Electron. D) $\alpha$-particle. Show Answer Correct Answer: B) Neutron. 9. 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. 10. 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. 11. A subatomic particle that has the same mass as a proton but no electric charge A) Neutron. B) Nucleus. C) Nuclear. D) Jimmy Neutron. Show Answer Correct Answer: A) Neutron. 12. What is atomic number? A) Number of neutrons. B) Number of neutrons and protons. C) Number of protons. D) Number of electrons. Show Answer Correct Answer: C) Number of protons. 13. 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. 14. Bohr atomic model could explain A) The spectrum of hydrogen molecule. B) Spectrum of an atom or ion containing one electron only. C) The spectrum only. D) The spectrum of hydrogen atom only. Show Answer Correct Answer: B) Spectrum of an atom or ion containing one electron only. 15. The number of neutrons in the element $^{9}$$_{4}$Be is A) 4. B) 9. C) 5. D) 13. Show Answer Correct Answer: C) 5. 16. 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) 51.99 amu. B) 52.19 amu. C) 53.45 amu. D) 17.33 amu. Show Answer Correct Answer: A) 51.99 amu. 17. 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. 18. The 20th Element on the periodic table A) Copper. B) Sodium. C) Lithium. D) Calcium. Show Answer Correct Answer: D) Calcium. 19. Name the central part of an atom where protons and neutrons are held together. A) Proton. B) Neutron. C) Electron. D) Nucleus. Show Answer Correct Answer: D) Nucleus. 20. Ar is the symbol for the element ..... A) Archaeopteryx. B) Argentium. C) Argon. D) Arsenic. Show Answer Correct Answer: C) Argon. 21. Which of the following determines the identity of an element? A) Number of protons. B) Atomic mass. C) Number of neutrons. D) Number of shells. Show Answer Correct Answer: A) Number of protons. 22. 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. 23. Protons and neutrons are collectively called as ..... A) Molecules. B) Electrons. C) Nucleons. D) None of the above. Show Answer Correct Answer: C) Nucleons. 24. 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. 25. Found orbiting outside the nucleus, this subatomic particle has a negative charge. A) Neutron. B) Proton. C) Electron. D) Idontknowatron. Show Answer Correct Answer: C) Electron. ← PreviousNext →Related 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 8Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 9Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books