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Chemistry - Structure of Atom

Practise 31 JEE Advanced previous year questions on Structure of Atom, compiled from papers spanning 2006 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.

Structure of Atom has been asked in 18 of the 27 years of JEE Advanced papers analysed (2000–2026), with 31 questions in all. 35% of them were easy, 55% moderate and 10% tough. Most of its questions came from 2010, with 5 questions that year. In the last three years (2024–2026) it had 4 questions across 6 papers, about 0.7 per paper.

The chapter's 6 topics are not weighted equally: Bohr's model (11 questions, 35%), Quantum mechanical model (9 questions, 29%), and Dual Behaviour of Matter and Heisenberg Uncertainty Principle (4 questions, 13%) have been asked the most. Bohr's model has also led over the last five years, with 5 questions. Quantum mechanical model has produced the most tough questions (3).

  1. 1The 2s and the 2p orbital energies of hydrogen atom are and , respectively. The 2s and the 2p orbital energies of lithium atom are and , res2026 (Paper 1)Bohr's model
  2. 2and are hydrogen-like species. The wavelength of light absorbed during the transition between the states with principal quantum numbers and 2026 (Paper 2)Bohr's model
  3. 3Among the following, the correct statement(s) for electrons in an atom is(are)2024 (Paper 1)Bohr's model
  4. 4According to Bohr's model, the highest kinetic energy is associated with the electron in the2024 (Paper 2)Bohr's model
  5. 5For He + , a transition takes place from the orbit of radius 105 . 8 pm to the orbit of radius 26 . 45 pm . The wavelength (in nm ) of the e2023 (Paper 2)Bohr's model
  6. 6Consider a helium He atom that absorbs a photon of wavelength 330 nm . The change in the velocity (in cm s - 1 ) of He atom after the photon2021 (Paper 2)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  7. 7The figure below is the plot of potential energy versus internuclear distance ( d ) of H 2 molecule in the electronic ground state. What is 2020 (Paper 2)Bohr's model
  8. 8The ground state energy of hydrogen atom is - 13.6 e V . Consider an electronic state of H e + whose energy, azimuthal quantum number and ma2019 (Paper 2)Quantum mechanical model
  9. 9Consider the Bohr s model of a one-electron atom where the electron moves around the nucleus. In the following List-I contains some quantiti2019 (Paper 2)Bohr's model
  10. 10Consider the Bohr s model of a one-electron atom where the electron moves around the nucleus. In the following List-I contains some quantiti2019 (Paper 2)Bohr's model
  11. 11The wave function, ψ n , l , m l is a mathematical function whose value depends upon spherical polar coordinates r , θ , ϕ of the electron a2017 (Paper 1)Quantum mechanical model
  12. 12The wave function, ψ n , l , m l is a mathematical function whose value depends upon spherical polar coordinates r , θ , ϕ of the electron a2017 (Paper 1)Quantum mechanical model
  13. 13The wave function, ψ n , l , m l is a mathematical function whose value depends upon spherical polar coordinates r , θ , ϕ of the electron a2017 (Paper 1)Quantum mechanical model
  14. 14P is the probability of finding the 1 s electron of the hydrogen atom in a spherical shell of infinitesimal thickness, dr , at a distance, r2016 (Paper 1)Quantum mechanical model
  15. 15Not considering the electronic spin, the degeneracy of the second excited state (n = 3 ) of H atom is 9 , while the degeneracy of the second2015 (Paper 1)Bohr's model
  16. 16In an atom, the total number of electrons having quantum numbers n = 4 , | m l | = 1 and m s = 1 / 2 is2014 (Paper 1)Electronic configuration
  17. 17The atomic masses of He and Ne are 4 and 20 amu , respectively. The value of the de Broglie wavelength of He gas at - 73 C is M times that o2013 (Paper 1)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  18. 18The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is is Bohr radius :2012 (Paper 1)Bohr's model
  19. 19Bombardment of aluminium by -particle leads to its artificial disintegration in two ways, (i) and (ii) as shown. Products and respectively a2011 (Paper 1)Atomic Mass and Atomic Size
  20. 20The maximum number of electrons that can have principal quantum number, and spin quantum number, , is2011 (Paper 1)Quantum mechanical model
  21. 21The work function ( ) of some metals is listed below. The number of metals which will show photoelectric effect when light of wavelength fal2011 (Paper 1)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  22. 22The number of neutrons emitted when undergoes controlled nuclear fission to and is2010 (Paper 1)Atomic Mass and Atomic Size
  23. 23Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule is2010 (Paper 2)Electronic configuration
  24. 24Paragraph: The hydrogen-like species is in a spherically symmetric state with one radial node. Upon absorbing light the ion undergoes transi2010 (Paper 2)Quantum mechanical model
  25. 25Paragraph: The hydrogen-like species is in a spherically symmetric state with one radial node. Upon absorbing light the ion undergoes transi2010 (Paper 2)Bohr's model
  26. 26Paragraph: The hydrogen-like species is in a spherically symmetric state with one radial node. Upon absorbing light the ion undergoes transi2010 (Paper 2)Quantum mechanical model
  27. 27Given, that the abundances of isotopes, and are , and , respectively, the atomic mass of is2009 (Paper 1)Atomic Mass and Atomic Size
  28. 28Statement 1 The plot of atomic number ( -axis) versus number of neutrons ( -axis) for stable nuclei shows a curvature towards -axis from the2008 (Paper 1)Hydrogen spectrum
  29. 29Match the entries in Column I with the correctly related quantum number(s) in Column II. Indicate your answer by darkening the appropriate b2008 (Paper 2)Quantum mechanical model
  30. 30Statement I Band gap in germanium is small. Statement II The energy spread of each germanium atomic energy level is infinitesimally small.2007 (Paper 2)Hydrogen spectrum
  31. 31According to Bohr's theory Total energy, Kinetic energy, Potential energy, Radius of th orbit2006Dual Behaviour of Matter and Heisenberg Uncertainty Principle

Frequently Asked Questions

1.How many questions are available for Structure of Atom?

This chapter includes 31 questions compiled from JEE Advanced papers spanning 2006 to 2026.

2.Are these questions only from JEE Advanced, or from other exams too?

These are JEE Advanced questions specifically for the Structure of Atom chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Structure of Atom an important chapter for JEE Advanced Chemistry?

Structure of Atom has appeared in 18 of the 21 years of JEE Advanced papers covered here, with 31 questions across 22 papers - about one per paper it appears in.

4.What is the difficulty level of Structure of Atom questions in JEE Advanced?

Of the 31 questions analysed for this chapter, 35% are easy, 55% moderate and 10% tough. 2010 had the most, with 5 questions.

5.Which topics in Structure of Atom should I focus on?

These topics have carried the most weightage in Structure of Atom:

  • Bohr's model - 11 questions (35%)
  • Quantum mechanical model - 9 questions (29%)
  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle - 4 questions (13%)
  • Quantum mechanical model has produced the most tough questions (3).
6.Is Structure of Atom's weightage in JEE Advanced going up or down?

Across all 22 papers analysed, Structure of Atom has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.