Atomic Structure for JEE

• Four quantum numbers: n, l, mₗ, mₛ
• Aufbau, Pauli and Hund's rules fill orbitals
• Cr and Cu are exceptions (half-filled and full d stability)
• Radial nodes = n − l − 1; angular nodes = l

• Eₙ = −13.6 Z²/n² eV
• 1/λ = R_H Z²(1/n₁² − 1/n₂²)
• Δx·Δp ≥ h/4π
• Number of spectral lines from level n = n(n − 1)/2

Printable Atomic Structure formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

• Counting nodes wrongly
• Forgetting the Cr and Cu exceptions
• Mixing physics and chemistry versions of Bohr energy units

Appears frequently. Quantum numbers and nodes appear often as direct questions.

Chapter names follow the current rationalised NCERT textbooks. Read these sections before solving PYQs.

Question. An electron in a hydrogen atom is in the 4th Bohr orbit. (a) Calculate the de Broglie wavelength of this electron in terms of the Bohr radius a₀. (b) Find the total number of orbitals for which (n + l) = 5, where n and l are the principal and azimuthal quantum numbers respectively. (c) Among these orbitals, identify the subshell that can accommodate a maximum of 10 electrons.

This example was solved twice independently and both solutions agree.

Full-chapter free lectures picked from YouTube search results by views, from established JEE channels (mostly in Hinglish). Use the subtopic list to jump straight to the part you need (timestamps come from each video's own chapter list). Watch one, then solve PYQs the same day.

• Atomic Structure in 1 Shot - All Concepts, Tricks & PYQs Covered | Class 11 | JEE Main & Advanced — JEE Wallah, 7:55:54
  Jump to a subtopic (58)

  • 0:00 Intro
  • 3:08 Discovery of Electrons(CRT)
  • 5:17 Characteristics of Cathode
  • 6:50 Millikan Oil Drop Experiment
  • 8:18 Calculation of Charge &
  • 9:20 Discovery of Proton
  • 10:46 Characteristics of Cathode
  • 11:59 Charge and Mass of Proton
  • 12:24 Discovery of Neutron
  • 14:03 Atomic Models
  • 14:47 Rutherford α particle
  • 17:26 Rutherford Nuclear Concept
  • 20:33 PYQs
  • 28:50 Relation b/w Radius of
  • 32:09 Distance of Closest Approach (Advanced)
  • 44:53 PYQs
  • 50:02 Drawbacks of Rutherford
  • 51:02 Atomic Number & Mass Number
  • 51:52 Questions
  • 57:08 Some definitions
  • 59:38 Questions
  • 1:02:50 Electromagnetic Radiation
  • 1:09:19 Formula
  • 1:09:59 EM Spectrum
  • 1:13:41 PYQs
  • 1:15:09 Black Body Radiation
  • 1:17:37 Photoelectric Effect
  • 1:35:57 Questions
  • 1:44:35 Graphs of Photoelectric
  • 1:54:39 Stopping Potential
  • 1:57:35 BREAK 1
  • 2:15:16 Planck's Quantum Theory
  • 2:22:55 Bohr's Theory
  • 2:43:42 Formulae based on Bohr's
  • 2:46:42 Questions
  • 2:48:17 Definitions (for 1electon
  • 2:57:13 Questions
  • 3:05:11 Hydrogen Spectrum
  • 3:16:57 Questions
  • 3:32:16 Spectral lines
  • 3:48:59 Zeeman Effect & Starck
  • 3:59:13 De-Broglie Hypothesis
  • 4:01:45 Formulae based on
  • 4:04:45 Questions
  • 4:12:33 Hysenberg's Uncertainty
  • 4:20:14 Questions
  • 4:25:47 Electronic Configuration
  • 4:30:32 Exchange of Energy
  • 4:32:03 Quantum Number
  • 4:36:45 Questions
  • 4:47:02 Shape of Orbitals
  • 4:50:32 PYQs
  • 5:25:36 BREAK 3
  • 5:45:32 Schrodinger Wave Equation
  • 5:59:32 Questions
  • 6:09:09 Graphs 📈
  • 6:42:47 Important Points & Energy
  • 7:48:18 Thank You❤️
• Atomic Structure FULL CHAPTER | Class 11th Physical Chemistry | Chapter 2 | Arjuna JEE — Arjuna JEE, 3:27:37
  Jump to a subtopic (16)

  • 00:00 Introduction
  • 04:11 Cathode ray tube
  • 10:29 Discovery of proton
  • 16:10 Question
  • 18:22 Atomic Models
  • 34:36 Isotopes
  • 41:30 Dual nature of electromagnetic radiations
  • 1:02:15 Photoelectric Effect
  • 1:14:15 What is spectrum?
  • 1:28:00 Bohr's atomic model
  • 1:53:25 Limitations of Bohr's atomic model
  • 1:56:20 Dual Nature of matter
  • 2:14:25 Heisenberg'suncertainity principle
  • 2:27:30 Quantum mechanical model
  • 2:56:25 Shape of atomic orbitals
  • 3:12:10 Energy of atomic orbitals

• 14 JEE Main 2026 PYQs on Atomic Structure, with solutions.
• Read the chapter in NCERT textbooks (official, free), then solve its NCERT Exemplar (official, free) questions.
• Chapter-wise past questions: JEE Main and Advanced PYQs and question bank.
• Timed practice tests: NTA Abhyas practice tests (official, free) and our free mock tests.
• See it move: interactive simulation.