Atomic Structure Quiz

Prepare for your chemistry exams with this challenging atomic structure MCQ quiz. Practice questions covering all key topics.

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1. Who discovered the electron using a cathode ray tube?

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2. Cathode rays are:

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3. Rutherford's alpha-scattering experiment led to the discovery of

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4. The mass of a proton is approximately equal to the mass of:

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5. In Bohr's model, electrons revolve around the nucleus in:

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6. According to Bohr's model, when an electron jumps from a higher energy level to a lower energy level, it:

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7. The energy of an electron in a Bohr orbit is:

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8. The Lyman series in the hydrogen spectrum corresponds to transitions to which energy level?

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9. Which region of the electromagnetic spectrum does the Balmer series lie in?

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10. What does the principal quantum number (n) represent?

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11. The azimuthal quantum number (l) is related to:

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12. The spin quantum number (ms) can have values of:

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13. An orbital with l = 0 is called a/an:

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14. How many electrons can a p subshell hold?

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15. What is the maximum number of electrons that can occupy the n=3 energy level?

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16. X-rays are produced when:

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17. The Zeeman effect refers to the:

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18. What is the formula for calculating the wave number?

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19. The wave number is related to the frequency (ν) and speed of light (c) by which of the following? (ν̃ is wave number)

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20. Which of the following is the correct order of filling of orbitals according to the Aufbau principle?

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21. The number of radial nodes for a 3s orbital is:

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22. Which of the following elements has the electronic configuration 1s²2s²2p⁶3s²3p⁶4s¹3d⁵?

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23. The shape of a p-orbital is:

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24. The maximum number of electrons that can have n=4 and l=2 is:

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25. Which of the following transitions in the hydrogen atom emits the photon with the longest wavelength?

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26. If an electron has the principal quantum number n=3, then the possible values of azimuthal quantum number (l) are:

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27. Which quantum number determines the spatial orientation of an orbital?

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28. The concept of wave-particle duality was proposed by:

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29. What does the term "degenerate orbitals" refer to?

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30. Which of the following is an isoelectronic species with O²⁻?

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31. The de Broglie wavelength of a moving particle is given by

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32. Which rule explains the filling of electrons in degenerate orbitals?

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33. What is the value of l for an f orbital?

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34. The spectrum of hydrogen shows lines in the visible region. These lines belong to which series?

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35. The energy of an electron is negative. What does this indicate?

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36. What type of spectrum is produced when white light passes through a cool gas?

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37. The formula for Rydberg constant is:

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38. What does the term "ground state" mean?

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39. What is the value of Planck's constant (h)?

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40. What is the value of Bohr radius (a₀)?

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41. The energy of electron in hydrogen atom is given by which formula?

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42. The wave number of a spectral line is equal to:

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43. Which of the following statements about the Bohr model is incorrect?

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Here are the key topics included in this quiz:

  • Discharge tube experiment
  • Cathode rays
  • Discovery of neutrons
  • Bohr model
  • Rutherford model
  • Properties of proton, neutron, electron
  • Derivation of Bohr model
  • Applications of Bohr model
  • Derivation of frequency
  • Derivation of wave number
  • Stark effect (basics)
  • Zeeman effect (basics)
  • Hydrogen spectrum
  • X-rays
  • Quantum numbers
  • Atomic orbitals
  • Electronic configuration