This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 4 Structure Of The Atom – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 4 Structure Of The Atom Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the atomic number of an element? A) Number of neutrons in the nucleus. B) Number of electrons in the nucleus. C) Number of protons in the nucleus. D) Number of molecules in the nucleus. Show Answer Correct Answer: C) Number of protons in the nucleus. 2. Who was the scientist that revived the ancient idea of the atom? A) Democritus. B) Aristotle. C) Dalton. D) None of the above. Show Answer Correct Answer: C) Dalton. 3. Which element's isotope is used as fuel in nuclear reactor? A) Cobalt. B) Oxygen. C) Iodine. D) Uranium. Show Answer Correct Answer: D) Uranium. 4. What is the mass contribution of a proton? A) 0 knit. B) It varies. C) 2 you. D) 1amu. Show Answer Correct Answer: D) 1amu. 5. Atoms of the same element with different numbers of neutrons A) Isotope. B) Nuclear equation. C) Nucleus. D) Atom. Show Answer Correct Answer: A) Isotope. 6. Generally, in a ..... atom, the number of ..... is equal to the number of electrons. A) Positively charged, protons. B) Negatively charged, neutrons. C) Neutral, neutrons. D) Neutral, protons. Show Answer Correct Answer: D) Neutral, protons. 7. The mass of one Avogadro's number of N atoms is equal to A) 14 u. B) 14 g. C) 28 g. D) 14 kg. Show Answer Correct Answer: B) 14 g. 8. If the f block contains 14 columns, then it would make sense that an f orbital can hold up to ..... electrons. A) 2. B) 5. C) 7. D) 14. Show Answer Correct Answer: D) 14. 9. Calcium-42 has 20 protons. How many neutrons does calcium-42 have? A) 20. B) 22. C) 42. D) None of the above. Show Answer Correct Answer: B) 22. 10. Which of the following cannot be the maximum number of electrons in a given shellaccording to the Bohr & Bury's rule for electronic configuration: A) 2. B) 6. C) 18. D) 32. Show Answer Correct Answer: B) 6. 11. Cations have what type of charge? A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 12. This particle determines what element you have-the elements identity. A) Electron. B) Proton. C) Neutron. D) Valence shell. Show Answer Correct Answer: B) Proton. 13. What is the mass number of an atom? A) The total number of protons and neutrons in the nucleus. B) The total number of protons in the nucleus. C) The total number of electrons in the atom. D) The total number of subatomic particles in the atom. Show Answer Correct Answer: A) The total number of protons and neutrons in the nucleus. 14. Protons have ..... charge. A) Positive. B) Negative. C) No. D) None of the above. Show Answer Correct Answer: A) Positive. 15. What is the maximum number of electrons that are allowed on the second orbital? A) 9. B) 7. C) 8. D) 3. Show Answer Correct Answer: C) 8. 16. Which of the following CAN NOT be the maximum number of electrons in a given shellaccording to the Bohr & Bury's rule for electronic configuration: A) 2. B) 6. C) 18. D) 32. Show Answer Correct Answer: B) 6. 17. The weighted average mass of the isotopes of that element A) Atomic mass. B) Atomic mass unit. C) Atomic number. D) Mass number. Show Answer Correct Answer: A) Atomic mass. 18. Which of the following is a p block element? A) Ca. B) Ar. C) Re. D) Au. Show Answer Correct Answer: B) Ar. 19. An element has 3 valence electrons in its outermost 3rd shell, the name of element is A) B. B) Al. C) Ga. D) In. Show Answer Correct Answer: B) Al. 20. What is the smallest part of matter that still retains the properties of its element? A) Atoms. B) Nucleus. C) Quarks. D) None of the above. Show Answer Correct Answer: A) Atoms. 21. The electron distribution in an aluminium atom is A) 2, 8, 3. B) 2, 8, 2. C) 8, 2, 3. D) 2, 3, 8. Show Answer Correct Answer: A) 2, 8, 3. 22. What principle states that no two electrons can have the same set of quantum numbers? A) Pauli exclusion principle. B) Dog's Rule. C) Building Principle. D) Heisenberg uncertainty principle. Show Answer Correct Answer: A) Pauli exclusion principle. 23. Atoms are the ..... building blocks A) Largest. B) Smallest. C) All the above. D) None of the above. Show Answer Correct Answer: B) Smallest. 24. Who discovered the existence of neutrons in the nucleus of an atom? A) Chadwick. B) Rutherford. C) Bohr. D) Goldstein. Show Answer Correct Answer: A) Chadwick. 25. A student cuts a piece of gold wire into the smallest possible pieces. Which statement best describes the smallest piece of gold wire? A) The gold changes properties and becomes a new element. B) The chemical properties of the gold change as the wire is cut. C) The smallest piece of wire is no longer gold. D) The wire is still gold and has become an atom of gold. Show Answer Correct Answer: D) The wire is still gold and has become an atom of gold. ← PreviousNext →Related QuizzesClass 9 Science Chapter 4 Structure Of The Atom Quiz 1Class 9 Science Chapter 4 Structure Of The Atom Quiz 2Class 9 Science Chapter 4 Structure Of The Atom Quiz 3Class 9 Science Chapter 4 Structure Of The Atom Quiz 4Class 9 Science Chapter 4 Structure Of The Atom Quiz 6Class 9 Science Chapter 4 Structure Of The Atom Quiz 7Class 9 Science Chapter 4 Structure Of The Atom Quiz 8Class 9 Science Chapter 4 Structure Of The Atom Quiz 9Class 9 Science Chapter 4 Structure Of The Atom Quiz 10Class 9 Science Chapter 4 Structure Of The Atom Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books