Classification of Elements and Periodicity for JEE

• Atomic radius decreases across a period, increases down a group
• Ionisation enthalpy generally rises across a period
• Exceptions: IE of N > O, Be > B
• Cl has more negative electron gain enthalpy than F

• Isoelectronic species: higher nuclear charge → smaller size
• Effective nuclear charge Z_eff = Z − σ
• Pauling electronegativity difference predicts bond polarity
• Second IE is always higher than first

Printable Classification of Elements and Periodicity formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

• Forgetting the N/O and Be/B exceptions
• Assuming F has the most negative electron gain enthalpy
• Mixing atomic and ionic radius trends

Appears regularly; quick marks. Direct trend questions, often with exceptions. Build an exceptions list.

Prerequisites: Atomic Structure.

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

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.

• Manzil 2026: PERIODIC TABLE in One Shot: All Concepts & PYQs Covered | JEE Main & Advanced — JEE Wallah, 6:57:25
  Jump to a subtopic (45)

  • 00:00 Introduction
  • 06:55 Topics to be covered
  • 09:46 Atom, Shell, Subshell
  • 18:40 Aufbau Principle
  • 49:48 Atomic Number Distribution
  • 01:03:15 Lanthanide Series
  • 01:23:20 Important
  • 01:25:36 IUPAC name of 101 to 118
  • 01:32:30 Name of Elements from 101 to 118
  • 01:42:10 Electronic configuration
  • 01:55:02 No of Electrons in Valence Shell
  • 02:19:52 Questions
  • 02:26:16 Transition Metals
  • 02:29:54 Metals, Non-Metals & Metalloids
  • 02:36:58 Effective Nuclear Charge
  • 02:44:30 Penetration Effect
  • 02:53:32 Atomic Radius
  • 03:02:05 Variation of Atomic size in the Periodic Table
  • 03:12:40 Ionic Radius
  • 03:19:16 Isoelectronic species
  • 03:26:24 Questions
  • 03:31:12 Boron Family
  • 03:38:20 Lanthanide & Actinide Contraction
  • 03:44:06 Effect of Lanthanide Contraction on D Block
  • 03:51:28 3d Series
  • 04:02:45 Ionisation Energy
  • 04:12:36 Factors Affecting I.E
  • 04:43:52 Questions
  • 04:50:12 Boron Family (2)
  • 05:10:20 Electron Gain Enthalpy
  • 05:21:20 Electron Affinity
  • 05:30:22 Electronic Configuration (2)
  • 05:35:58 Penetration Effect
  • 05:38:48 UQT Points
  • 05:49:12 Electron Affinity of F & Cl
  • 06:04:30 Important
  • 06:08:00 Relation between IE & EGE
  • 06:16:45 Electronegativity
  • 06:23:17 Pauling Scale
  • 06:31:56 Diagonal Relationship
  • 06:35:05 Oxidation state in Oxides
  • 06:45:51 Acidic Nature of Oxides
  • 06:49:45 Modern Periodic Table
  • 06:52:54 Questions
  • 06:56:10 Thank you
• Periodic Table: COMPLETE Chapter in 1 Video | Quick Revision | Class 11 Arjuna JEE — Arjuna JEE, 1:21:59
  Jump to a subtopic (28)

  • 00:00 Introduction
  • 02:36 Periodic table
  • 03:50 Genesis of Periodic classification
  • 17:00 Nomenclature of elements with Atomic Number 100
  • 18:01 Electronic configuration of elements and the periodic table
  • 24:33 Metals,non-metals and metalloids
  • 25:55 How to predict group block, and period?
  • 27:55 Shielding effect
  • 29:18 Effective nuclear charge
  • 30:00 Slater’s rule
  • 32:29 Periodicity in properties
  • 33:32 Types of radius
  • 39:33 Factors affecting the atomic radius
  • 40:42 Periodic variation of atomic radius
  • 48:16 Ionisation enthalpy (IE)
  • 50:02 Factors affecting Ionisation enthalpy
  • 51:22 Periodicity in Ionisation enthalpy
  • 57:09 Applications of Ionisation enthalpy
  • 59:10 Electron gain enthalpy/ Electron affinity
  • 1:03:13 Factors affecting electron gain enthalpy/electron affinity
  • 1:04:34 Periodicity in electron gain enthalpy/ electron affinity
  • 1:06:54 Electronegativity
  • 1:11:00 Factors affecting electronegativity
  • 1:12:96 Periodicity in electronegativity
  • 1:15:38 Valency or oxidation state
  • 1:17:08 Anomalous properties of second-period elements
  • 1:18:36 Chemical reactivity
  • 1:21:31 Thank You Bacchon

• 7 JEE Main 2026 PYQs on Classification of Elements and Periodicity, 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.