This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The subatomic particle called electron was discovered by: A) J. J. Thompson. B) Neils Bohr. C) James Chadwick. D) E. Goldstein. Show Answer Correct Answer: A) J. J. Thompson. 2. An element's atomic number tells how many ..... are in the nucleus of an atom of that element. A) Protons. B) Neutrons. C) Electrons. D) None of the above. Show Answer Correct Answer: A) Protons. 3. ATOM HAS A POSITIVELY CHARGED NUCLEUSTHIS WAS PROPOSED BY SCIENTIST: A) J.J.THOMSON. B) E.GOLDSTEIN. C) RUTHERFORD. D) NEILS BOHR. Show Answer Correct Answer: C) RUTHERFORD. 4. Isotopes of an element have A) The same physical properties. B) Different chemical properties. C) Different number of neutrons. D) Different atomic numbers. Show Answer Correct Answer: C) Different number of neutrons. 5. An alpha particle is also known as:(a) subatomic particle(b) an unionised helium atom(c) a neutral particle(d) a doubly-charged helium ion A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 6. Which of the following has an magnetic moment of 2.83 BM A) Ti3+. B) Ni2+. C) Cr3+. D) Mn2+. Show Answer Correct Answer: B) Ni2+. 7. Which of the following are neutral? A) Radicals. B) Electrons. C) Neutrons. D) None of the above. Show Answer Correct Answer: C) Neutrons. 8. Which of the following is incorrect about the quantum variable m, or m$_{l}$? A) M =-l l. B) The value for p is-1, 0, 1. C) When l is 2, there are 5 values for m. D) The value is either +1/2 or-1/2. Show Answer Correct Answer: D) The value is either +1/2 or-1/2. 9. What are the three particles that make up the atom? A) Protons, neutrons and isotopes. B) Protons, negatives and electrons. C) Neutrons, isotopes and electrons. D) Protons, neutrons and electrons. Show Answer Correct Answer: D) Protons, neutrons and electrons. 10. What do neutrons most contribute to in an atom? A) Atomic Number. B) Charge. C) Mass. D) Weight. Show Answer Correct Answer: C) Mass. 11. He believed that all matter was continuous and that four basic elements existed (earth, wind, fire, water). A) Democritus. B) Aristotle. C) Chadwick. D) Thomson. Show Answer Correct Answer: B) Aristotle. 12. Why does the proton determine the identity of an atom? A) The number of protons determines the atomic mass. B) The number of protons determines chemical properties, such as reactivity. C) The number of protons in an atom's nucleus determines an element's atomic number. D) The number of protons decides the radioactive properties of an atom. Show Answer Correct Answer: C) The number of protons in an atom's nucleus determines an element's atomic number. 13. ..... are defined as the atoms of the same element, having the same atomic number but different mass numbers A) Isatopes. B) Isotopes. C) Isobars. D) Isopotes. Show Answer Correct Answer: B) Isotopes. 14. What is the mass number?Protons:8Neutrons:8Electrons:8 A) 0. B) 8. C) 16. D) 24. Show Answer Correct Answer: C) 16. 15. What is true of all neutral atoms? A) They have equal numbers of neutrons and electrons. B) They have equal numbers of protons and neutrons. C) They have equal numbers of protons and electrons. D) None of the above. Show Answer Correct Answer: C) They have equal numbers of protons and electrons. 16. Which of the following sets of quantum numbers are correct? n l ml(i) 1 1 +2(ii) 2 1 +1(iii) 3 2-2(iv) 3 4-2 A) (i), (ii). B) (i), (iii). C) (i), (iv). D) (ii), (iv). Show Answer Correct Answer: C) (i), (iv). 17. A neutral atom has an equal number of positive and negative charges. If a neutral Flourine atom has 9 protons and 10 neutrons, how many electrons will it have? A) 10. B) 9. C) 8. D) 7. Show Answer Correct Answer: B) 9. 18. Ca is the symbol for ..... A) Carbon. B) Calcium. C) Copper. D) Chlorine. Show Answer Correct Answer: B) Calcium. 19. 16-An element belongs to period 2 and group 2 $^{th}$ number of valence electrons in the atoms of this element is. A) 2. B) 4. C) 3. D) 1. Show Answer Correct Answer: A) 2. 20. Isotopes have a different what? A) Atomic Number. B) Atomic Mass. C) Number of Protons. D) Number of electrons. Show Answer Correct Answer: B) Atomic Mass. 21. The number of neutrons in $_{82}$Pb$^{207}$ is A) 123. B) 82. C) 125. D) 85. Show Answer Correct Answer: C) 125. 22. What is a substance made of two or more elements called? A) Element. B) Compound. C) Ion. D) Isotope. Show Answer Correct Answer: B) Compound. 23. WHICH OF THE FOLLOWING IS RESPONSIBLE FOR MASS OF AN ATOM A) NO OF PROTONS. B) NO OF ELECTRONS. C) NO OF PROTONS AND NEUTRONS. D) NO OF NEUTRONS. Show Answer Correct Answer: C) NO OF PROTONS AND NEUTRONS. 24. Which of the subatomic particles has relatively no mass A) All have the same mass. B) Protons. C) Neutrons. D) Electrons. Show Answer Correct Answer: D) Electrons. 25. Rutherford's experiment is known as A) The silver foil experiment. B) The bronze foil experiment. C) The copper foil experiment. D) The gold foil experiment. Show Answer Correct Answer: D) The gold foil experiment. 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