Atomic Structure JEE Main PYQs PDF, 2020–2026

Atomic Structure questions per year

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 169 of the 170 asked.

Topic-wise weightage by year

How many Atomic Structure questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 26 JEE Main 2026 Atomic Structure questions in the free PDF, latest shift first.

1. JEE Main 2026 · 8 Apr · Shift 2 · Atomic Spectra

   Consider two radiations of wavelengths

   1. $\lambda_{1}=2000\overset{{{\mathrm{o}}}}{{\mathrm{A}}}$

   2. $\lambda_{2}=6000\overset{{{\mathrm{o}}}}{{\mathrm{A}}}$

   The ratio of the energies of these two radiations $\left(\frac{E_{1}}{E_{2}}\right)$ is $\_\_\_\_$ (Nearest integer).

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2. JEE Main 2026 · 6 Apr · Shift 1 · Atomic Spectra

   If shortest wavelength of hydrogen atom in Lyman series is $x$, then longest wavelength in Balmer series of ${\mathrm{He}}^{{+}}$is:

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3. JEE Main 2026 · 6 Apr · Shift 2 · Bohr's Model

   The Bohr radius of a hydrogen like species is 70.53 pm . The species and the stationary state (n) are respectively

   (Given : Hydrogen atom Bohr radius is 52.9 pm )

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4. JEE Main 2026 · 6 Apr · Shift 1 · Orbitals and Electronic Configuration

   $\text{ Match the LIST-I with LIST-II}$

   List-I Orbital		List-II Radial nodes and nodal plane
   A.	2s	I.	1 Radial node + two nodal planes
   B.	3s	II.	1 Radial node + one nodal plane
   C.	3p	III.	2 Radial nodes + No nodal plane
   D.	4d	IV.	1 Radial node + No nodal plane

   Choose the correct answer from the options given below:
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5. JEE Main 2026 · 5 Apr · Shift 2 · Quantum Numbers

   Which of the following statement(s) is/are true ?

   A. If two orbitals have the same value of ( ${\mathrm{n}}+l$ ), the orbital with lower value of n will have lower energy.

   B. Energies of the orbitals in the same subshell increase with increase in atomic number.

   C. The size of $2{\mathrm{p}}_{x}$ orbital is less than the size of $3{\mathrm{p}}_{x}$ orbital.

   D. Among 5f, 6s, 4d, 5p and 5d orbitals, none of the orbitals have 2 radial nodes.

   Choose the correct answer from the options given below :

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6. JEE Main 2026 · 5 Apr · Shift 1 · Quantum Numbers

   Arrange the following atomic orbitals of multi electron atoms in order of increasing energy.

   A. $n=3,l=2,m=+1$

   B. $n=4,l=0,m=0$

   C. $n=6,l=1,m=0$

   D. $n=5,l=1,m=+1$

   E. $n=2,l=1,m=+1$

   Choose the correct answer from the options given below:

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7. JEE Main 2026 · 5 Apr · Shift 1 · Orbitals and Electronic Configuration

   Identify the correct statements from the following :

   A. Heisenberg uncertainty principle is applicable to electrons.

   B. The size of $2p_{x}$ orbital is less than the size of $3p_{x}$ orbital.

   C. The energy of 2 s orbital of H atom is equal to the energy of 2 s orbital of Li .

   D. The electronic configuration of Cr is $[{\mathrm{Ar}}]3{\ \mathrm{d}}^{5}4{\ \mathrm{s}}^{1}$

   Choose the correct answer from the options given below:

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8. JEE Main 2026 · 4 Apr · Shift 1 · Quantum Numbers

   Which of the following is correct set of 4 quantum numbers of ${19}^{{\text{th}}}$ electron in Chromium (Atomic number $=24$ ) in accordance with Aufbau principle?

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9. JEE Main 2026 · 4 Apr · Shift 1 · Atomic Spectra

   What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett series?

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10. JEE Main 2026 · 4 Apr · Shift 2 · Bohr's Model

    The species having identical radii according to the Bohr's theory are :

    A. H (first orbit)

    B. ${\mathrm{He}}^{{+}}$(first orbit)

    C. ${\mathrm{He}}^{{+}}$(Second orbit)

    D. ${\mathrm{Li}}^{{2+}}$ (first orbit)

    E. ${\mathrm{Be}}^{{3+}}$ (Second orbit)

    Choose the correct answer from the options given below :

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11. JEE Main 2026 · 2 Apr · Shift 1 · Bohr's Model

    What is the energy (in J atom⁻¹) required for the following process?

    Li²⁺ (g) → Li³⁺ (g) + e⁻

    (Take the ionization energy for the H atom in the ground state as $2.18\times {10}^{{-18}}\text{ J atom}^{{-1}}$)

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12. JEE Main 2026 · 2 Apr · Shift 2 · Bohr's Model

    The surface of sodium metal is irradiated with radiation of wavelength $x$ nm. The kinetic energy of ejected electrons is $2.8\times {10}^{{-20}}\ \text{J}$. The work function of sodium is $2.3$ eV. The value of $x$ is ________ $\times {10}^{2}$ nm. (Nearest integer)

    (Given: $h=6.6\times {10}^{{-34}}\ \text{J s}$ ; $1\ \text{eV}=1.6\times {10}^{{-19}}\ \text{J}$ ; $c=3.0\times {10}^{8}\ \text{m s}^{{-1}}$)

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Practise the 2026 Atomic Structure questions online

Sample questions from recent papers

JEE Main 2026 · 28 Jan · Shift 1 · Orbitals and Electronic Configuration

Figure 1. electron probability density for 2 s orbital

Figure 2. wave function for 2s orbital

Which of the following point in Figure 2 most accurately represents the nodal surface as shown in Figure 1?

1. (A)

   D

2. (B)

   B

3. (C)

   C

4. (D)

   A

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Answer: (B)

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JEE Main 2025 · 7 Apr · Shift 2 · Aufbau, Pauli and Hund

The extra stability of half-filled subshell is due to :

(A) Symmetrical distribution of electrons

(B) Smaller coulombic repulsion energy

(C) The presence of electrons with the same spin in non-degenerate orbitals

(D) Larger exchange energy

(E) Relatively smaller shielding of electrons by one another

Indentify the correct statements :

1. (A)(B), (D) and (E) only
2. (B)$(A),(B),(D)$ and (E) only
3. (C)(B), (C) and (D) only
4. (D)$(A),(B)$ and (D) only

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Answer: (B)

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JEE Main 2024 · 1 Feb · Shift 1 · Discovery of Subatomic Particles

According to the wave-particle duality of matter by de-Broglie, which of the following graph plot presents most appropriate relationship between wavelength of electron $(\lambda)$ and momentum of electron $(p)$?

1. (A)
2. (B)
3. (C)
4. (D)

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Answer: (D)

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JEE Main 2023 · 11 Apr · Shift 2 · Shapes of Orbitals

The number of correct statements from the following is ___________.

A. For $1 \mathrm{s}$ orbital, the probability density is maximum at the nucleus

B. For $2 \mathrm{s}$ orbital, the probability density first increases to maximum and then decreases sharply to zero.

C. Boundary surface diagrams of the orbitals encloses a region of $100 \%$ probability of finding the electron.

D. p and d-orbitals have 1 and 2 angular nodes respectively.

E. probability density of p-orbital is zero at the nucleus

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Answer: 3

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The free PDF above has all 169 questions grouped by topic, with an answer key.

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