Atomic Structure — JEE Main PYQs & Practice Questions

Atomic Structure is a Chemistry chapter in the JEE Main syllabus. This page brings together 171 previous-year and practice questions on Atomic Structure, organised into 7 topics: Bohr's Model, Quantum Numbers, Orbitals and Electronic Configuration, Atomic Spectra, Discovery of Subatomic Particles, Shapes of Orbitals and Aufbau, Pauli and Hund. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Atomic Structure JEE Main PYQs as a free PDF (with answer key)

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Bohr's Model

• The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be…
• Given below are two statements : Statement I : Bohr's theory accounts for the stability…
• The radius of the 2ⁿᵈ orbit of Li²⁺ is x. The expected radius of the 3ʳᵈ orbit of Be³⁺ is
• The electron in the nᵗʰ orbit of Li²⁺ is excited to (n+1) orbit using the radiation of…
• The wavelength of an electron and a neutron will become equal when the velocity of the…
• The value of Rydberg constant (R_H) is 2.18 × 10⁻¹⁸ J. The velocity of electron having…
• The maximum number of electrons that can be accommodated in the valence shell of carbon…
• Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6 Aᵒ . The radius…
• Identify the INCORRECT statements from the following : A. Notation ₁₂²⁴Mg represents 24…
• Which of the following statements regarding the energy of the stationary state is true…
• According to Bohr's atomic theory : (A) Kinetic energy of electron is ∝ Z²/n². (B) The…
• Given below are two statements : Statement I : Rutherford's gold foil experiment cannot…
• The longest wavelength of light that can be used for the ionisation of lithium atom (Li)…
• For hydrogen like species, which of the following graphs provides the most appropriate…
• The wavelength of spectral line obtained in the spectrum of Li²⁺ ion, when the…
• Which of the following postulate of Bohr's model of hydrogen atom is not in agreement…
• The Bohr radius of a hydrogen like species is 70.53 pm . The species and the stationary…
• Two positively charged particles m₁ and m₂ have been accelerated across the same…
• Which one of the following about an electron occupying the 1 s orbital in a hydrogen…
• The difference between the radii of 3ʳᵈ and 4ᵗʰ orbits of Li²⁺ is R₁ . The difference…

Quantum Numbers

• The number of orbitals with n = 5, m₁ = +2 is ___________. (Round off to the Nearest…
• Which of the following is correct set of 4 quantum numbers of 19ᵗʰ electron in Chromium…
• The value of magnetic quantum number of the outermost electron of Zn⁺ ion is…
• The minimum uncertainty in the speed of an electron in an one dimensional region of…
• In an atom, total number of electrons having quantum numbers n=4,| mₗ|=1 and mₛ=-1/2 is…
• Correct statements for an element with atomic number 9 are: A. There can be 5 electrons…
• The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37)…
• The orbital angular momentum of an electron in 3 s orbital is (x h)/(2 π). The value of…
• A certain orbital has n = 4 and m L = -3. The number of radial nodes in this orbital is…
• Arrange the following atomic orbitals of multi electron atoms in order of increasing…
• In a multielectron atom, which of the following orbitals described by three quantum…
• Given, (A) n=5, m₁=-1 (B) n=3,l=2, m₁=-1, mₛ=+1/2 The maximum number of electron(s) in…
• The number of electrons present in all the completely filled subshells having n=4 and…
• The maximum number of orbitals which can be identified with n=4 and mₗ=0 is _________.
• Consider the hypothetical situation where the azimuthal quantum number, l, takes values…
• Compare the energies of following sets of quantum numbers for multielectron system. (A)…
• Consider the ground state of chromium atom (Z=24). How many electrons are with Azimuthal…
• The number of orbitals associated with quantum number n = 5, mₛ = +1/2 is :
• Consider the following statements : (A) The principal quantum number 'n' is a positive…
• Consider the following pairs of electrons (A) (a) n = 3, l = 1, m₁ = 1, mₛ = + 1/2 (b) n…

Orbitals and Electronic Configuration

• Number of electrons present in 4f orbital of Ho³⁺ ion is ____________. (Given Atomic No…
• The total number of isoelectronic species from the given set is ___________. O²⁻, F⁻…
• The correct decreasing order of energy for the orbitals having, following set of quantum…
• The number of atomic orbitals from the following having 5 radial nodes is ___________. 7…
• The atomic number of Boron is 5 and Aluminium is 13. The number of electrons in Al³⁺ is x.
• Match List I with List II. List I Species | List II Electronic distribution; (A) | Cr⁺²…
• The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium =99)
• Given below are two statements : Statement (I) : The orbitals having same energy are…
• Identify the correct statements from the following : A. Heisenberg uncertainty principle…
• The pair, in which ions are isoelectronic with AI³⁺ is :
• A certain orbital has no angular nodes and two radial nodes. The orbital is :
• Given below are two statements : Statement (I) : A spectral line will be observed for a…
• Choose the correct option having all the elements with d¹⁰ electronic configuration from…
• The number of 4f electrons in the ground statement electronic configuration of Gd²⁺ is…
• Ge(Z = 32) in its ground state electronic configuration has x completely filled orbitals…
• Total number of ions from the following with noble gas configuration is _________…
• Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d⁵ :
• The number of s-electrons present in an ion with 55 protons in its unipositive state is
• Which one of the following sets of ions represents a collection of isoelectronic…
• Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________

Atomic Spectra

• The number of incorrect statement/s about the black body from the following is…
• The region in the electromagnetic spectrum where the Balmar series lines appear is :
• A hypothetical electromagnetic wave is show below. The frequency of the wave is x × 10¹⁹…
• The ionization energy of sodium in kJ mol⁻¹, if electromagnetic radiation of wavelength…
• Given below are two statements : Statement I : When an electric discharge is passed…
• A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of…
• Which of the following statements are correct, if the threshold frequency of caesium is…
• Wavenumber for a radiation having 5800 Aᵒ wavelength is x × 10 cm⁻¹ The value of x is…
• The wave numbers of three spectral lines of H atom are considered. Identify the set of…
• The work function of sodium metal is 4.41 × 10 –19 J. If photons of wavelength 300 nm…
• If shortest wavelength of hydrogen atom in Lyman series is x, then longest wavelength in…
• If the wavelength for an electron emitted from H-atom is 3.3 × 10⁻¹⁰ m, then energy…
• The energy of first (lowest) Balmer line of H atom is x J. The energy (in J) of second…
• The hydrogen spectrum consists of several spectral lines in Lyman series (L₁,L₂, L₃…;L₁…
• When the excited electron of a H atom from n = 5 drops to the ground state, the maximum…
• Number of spectral lines obtained in He⁺ spectra, when an electron makes transition from…
• If the work function of a metal is 6.63 × 10⁻¹⁹J, the maximum wavelength of the photon…
• Match List I with List II List - I (Spectral Series for Hydrogen) | List - II (Spectral…
• The shortest wavelength of hydrogen atom in Lyman series is λ. The longest wavelength is…
• The work functions of two metals (M_A and M_B) are in the 1:2 ratio. When these metals…

Discovery of Subatomic Particles

• The minimum energy that must be possessed by photons in order to produce the…
• If the Thompson model of the atom was correct, then the result of Rutherford's gold foil…
• Consider an imaginary ion ₂₂⁴⁸ X³⁻. The nucleus contains 'a'% more neutrons than the…
• According to the wave-particle duality of matter by de-Broglie, which of the following…
• Given below are two statements : one is labelled as Assertion A and the other is…
• Electrons in a cathode ray tube have been emitted with a velocity of 1000 m s⁻¹. The…
• A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10…
• Given below are two statements, one is labelled as Assertion A and the other is labelled…
• If the uncertainty in velocity and position of a minute particle in space are, 2.4 ×…

Shapes of Orbitals

• The number of given orbitals which have electron density along the axis is _________…
• The number of correct statements from the following is ___________. A. For 1 s orbital…
• The number of radial nodes and total number of nodes in 4p orbital respectively are :
• The orbital having two radial as well as two angular nodes is :
• The number of radial and angular nodes in 4d orbital are, respectively
• The plots of radial distribution functions for various orbitals of hydrogen atom against…
• Which of the following is the correct plot for the probability density ψ ² (r) as a…
• The correct statement about probability density (except at infinite distance from…

Aufbau, Pauli and Hund

• In the sixth period, the orbitals that are filled are :
• The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of…
• Which of the following statements are correct? (A) The electronic configuration of Cr is…
• Given below are two statements. One is labelled as Assertion A and the other is labelled…
• Arrange the following orbitals in decreasing order of energy. A. n=3, l=0, m=0 B. n=4…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Atomic Structure questions are there for JEE Main?

PrepWiser has 171 Atomic Structure questions for JEE Main, grouped into 7 topics such as Bohr's Model, Quantum Numbers and Orbitals and Electronic Configuration.

Are these Atomic Structure questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Atomic Structure questions?

Open any Atomic Structure question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.