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Chemistry - Structure of Atom

Practise 78 NEET previous year questions on Structure of Atom, compiled from papers spanning 2002 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 NEET tests.

Structure of Atom has been asked in 25 of the 39 years of NEET papers analysed (1988–2026), with 78 questions in all. 42% of them were easy, 47% moderate and 10% tough. Most of its questions came from 2023, with 6 questions that year. In the last three years (2024–2026) it had 10 questions across 13 papers, about 0.8 per paper.

The chapter's 6 topics are not weighted equally: Quantum mechanical model (29 questions, 37%), Dual Behaviour of Matter and Heisenberg Uncertainty Principle (15 questions, 19%), and Atomic Mass and Atomic Size (12 questions, 15%) have been asked the most. Quantum mechanical model has also led over the last five years, with 10 questions. Dual Behaviour of Matter and Heisenberg Uncertainty Principle has produced the most tough questions (3).

  1. 1Match List I with List II : List I (Quantum Numbers) List II (Orbital) 'n' 'l' A. I. B. II. C. III. D. IV. Choose the correct answer from th2026 (Cancelled)Quantum mechanical model
  2. 2A bulb is rated at watt, converting energy into light. If energy of one photon is J, how many photons are emitted by the bulb per second ?2026 (Cancelled)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  3. 3Consider the following schematic plots of orbital wavefunction ( ) against distance ( ) from the nucleus. The figure representing two radial2026 (Re-NEET)Quantum mechanical model
  4. 4The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes and transitions, respectively, is2025Hydrogen spectrum
  5. 5Energy and radius of first Bohr orbit of and are [Given ]2025Bohr's model
  6. 6The energy of an electron in the ground state for ion is , then that for an electron in state for ion in J is2024Bohr's model
  7. 7Match List I with List II Choose the correct answer from the options given below :2024Quantum mechanical model
  8. 8Which of the following pairs of ions will have same spin only magnetic moment values within the pair? A. B. C. D. Choose the correct answer 2024 (Re-NEET)Quantum mechanical model
  9. 9The quantum numbers of four electrons are given below : I. II. III. IV. The correct decreasing order of energy of these electrons is2024 (Re-NEET)Quantum mechanical model
  10. 10Given below are two statements: Statement I: The Balmer spectral line for atom with lowest energy is locateld at . Rydberg constant Statemen2024 (Re-NEET)Hydrogen spectrum
  11. 11The element expected to form largest ion to achieve the nearest noble gas configuration is :2023 (All India)Atomic Mass and Atomic Size
  12. 12Select the correct statements from the following : A. Atoms of all elements are composed of two fundamental particles. B. The mass of the el2023 (All India)Atomic Mass and Atomic Size
  13. 13The relation between n m ( n m = the number of permissible values of magnetic quantum number ( m ) ) for a given value of azimuthal quantum 2023 (All India)Quantum mechanical model
  14. 14Which one of the following represents all isoelectronic species?2023 (Manipur)Atomic Mass and Atomic Size
  15. 15Given below are two statements : Statement I : The value of wave function, depends upon the coordinates of the electron in the atom. Stateme2023 (Manipur)Quantum mechanical model
  16. 16Incorrect set of quantum numbers from the following is2023 (Manipur)Quantum mechanical model
  17. 17Identify the incorrect statement from the following.2022 (Phase 1)Quantum mechanical model
  18. 18If radius of second Bohr orbit of the He + ion is 105 . 8 pm , what is the radius of third Bohr orbit of Li 2 + ion?2022 (Phase 1)Bohr's model
  19. 19Match List-I with List-II: Choose the correct answer from the options given below :2022 (Phase 2)Quantum mechanical model
  20. 20When electromagnetic radiation of wavelength falls on the surface of a metal, electrons are emitted with the kinetic energy of . What is the2022 (Phase 2)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  21. 21A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1 , 368 kHz (kilo Hertz). The wavelength of the electromagn2021Hydrogen spectrum
  22. 22From the following pairs of ions which one is not an iso-electronic pair?2021Atomic Mass and Atomic Size
  23. 23The calculated spin only magnetic moment of Cr 2 + ion is2020 (Phase 1)Quantum mechanical model
  24. 24The number of protons, neutrons and electrons in 71 175 Lu , respectively, are2020 (Phase 1)Atomic Mass and Atomic Size
  25. 25The number of angular nodes and radial nodes in 3 s orbital are2020 (Phase 2)Quantum mechanical model
  26. 26The potential energy ( y ) curve for H 2 formation as a function of internuclear distance ( x ) of the H atoms is shown below. The bond ener2020 (Phase 2)Bohr's model
  27. 274 d , 5 p , 5 f and 6 p orbitals are arranged in the order of decreasing energy. The correct option is:2019 (All India)Quantum mechanical model
  28. 28Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?2019 (All India)Hydrogen spectrum
  29. 29Orbital having 3 angular nodes and 3 total nodes is2019 (Odisha)Quantum mechanical model
  30. 30In hydrogen atom, the de-Broglie wavelength of an electron in the second Bohr orbit is [Given that, Bohr radius, ]2019 (Odisha)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  31. 31Which one is a wrong statement?2018Electronic configuration
  32. 32Which one of the following statements is wrong?2017Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  33. 33Two electrons occupying the same orbital are distinguished by:2016 (Phase 1)Quantum mechanical model
  34. 34How many electrons can fit in each orbital for which n = 3 and l = 1 ?2016 (Phase 2)Quantum mechanical model
  35. 35Which of the following pairs of d - orbitals will have the electron density along the axis?2016 (Phase 2)Quantum mechanical model
  36. 36Which of the following pairs of iron are isoelectronic and isostructural?2015 (Phase 1)Atomic Mass and Atomic Size
  37. 37The number of d -electrons in Fe 2 + ( Z = 26 ) is not equal to the number of electrons in which one of the following?2015 (Phase 1)Electronic configuration
  38. 38The angular momentum of electron in d -orbital is equal to2015 (Phase 1)Quantum mechanical model
  39. 39Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. No. Z = 22)2015 (Phase 2)Electronic configuration
  40. 40What is the maximum number of orbitals that can be identified with the following quantum number n = 3 , l = 1 , m = 0 ?2014Quantum mechanical model
  41. 41Calculate the energy in corresponding to light of wavelength 45 n m : (Planck s constant h = 6.63 10 - 34 J s : s p e e d o f l i g h t c = 2014Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  42. 42B e 2 + is isoelectronic with which of the following ions?2014Atomic Mass and Atomic Size
  43. 43Magnetic moment 2 . 83 BM is given by which of the following ions? (At.nos. T i = 22 , C r = 24 , M n = 25 , N i = 28 )2014Quantum mechanical model
  44. 44The value of Planck's constant is . The speed of light is . Which value is closest to the wavelength in nanometer of a quantum of light with2013 (All India)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  45. 45What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? and2013 (All India)Quantum mechanical model
  46. 46Based on equation certain conclusions are written. Which of them is not correct?2013 (All India)Bohr's model
  47. 47A magnetic moment of will be shown by one among the following2013 (All India)Quantum mechanical model
  48. 48According to law of photochemical equivalence the energy absorbed (in erg/ mole is given as ergs, :2013 (Karnataka)Dual Behaviour of Matter and Heisenberg Uncertainty Principle
  49. 49The orbital angular momentum of a p-electron is given as2012 (Mains)Quantum mechanical model
  50. 50Maximum number of electrons in a subshell with and is2012 (Screening)Quantum mechanical model

Frequently Asked Questions

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

This chapter includes 78 questions compiled from NEET papers spanning 2002 to 2026.

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

These are NEET questions specifically for the Structure of Atom chapter. Questions from other exams like AIIMS or JIPMER are organised separately under their respective exam sections.

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

Structure of Atom has appeared in 25 of the 25 years of NEET papers covered here, with 78 questions across 39 papers - about 2 per paper it appears in.

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

Of the 78 questions analysed for this chapter, 42% are easy, 47% moderate and 10% tough. 2023 had the most, with 6 questions.

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

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

  • Quantum mechanical model - 29 questions (37%)
  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle - 15 questions (19%)
  • Atomic Mass and Atomic Size - 12 questions (15%)
  • Dual Behaviour of Matter and Heisenberg Uncertainty Principle has produced the most tough questions (3).
6.Is Structure of Atom's weightage in NEET going up or down?

Across all 39 papers analysed, Structure of Atom has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.