GyanGhar GyanGhar

Class 11 · Chemistry · Chapter 3

Classification of Elements and Periodicity in Properties

This chapter tells the story of how chemists organised the 118 known elements into the modern Periodic Table — from Dobereiner's triads and Newlands' octaves to Mendeleev's brilliant predictions and the modern periodic law based on atomic number. You'll learn how the electronic configuration of an atom decides its position in the s-, p-, d-, or f-block, and then dive deep into the five big periodic trends — atomic radius, ionic radius, ionization enthalpy, electron gain enthalpy, and electronegativity. The chapter closes with periodicity in chemical properties (valence, oxide character, anomalous behaviour of the second period, and diagonal relationships) — a high-yield area for both Board exams and JEE/NEET.

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Topics in this chapter

  1. 1

    Introduction & Early Attempts at Classification

    Quiz included

  2. 2

    Mendeleev's Periodic Table & the Modern Periodic Law

    Quiz included

  3. 3

    Present Form of the Periodic Table & Nomenclature of Super-heavy Elements

    Quiz included

  4. 4

    Electronic Configurations & the s-, p-, d-, f-Block Classification

    Quiz included

  5. 5

    Types of Elements — Metals, Non-metals, Metalloids & Noble Gases

    Quiz included

  6. 6

    Periodic Trend — Atomic Radius

    Quiz included

  7. 7

    Ionic Radius & Isoelectronic Species

    Quiz included

  8. 8

    Ionization Enthalpy

    Quiz included

  9. 9

    Electron Gain Enthalpy

    Quiz included

  10. 10

    Electronegativity

    Quiz included

  11. 11

    Periodic Trends in Chemical Properties — Valence, Oxides & Anomalous Behaviour

    Quiz included

  12. 12

    Solved Examples

  13. 13

    Strategic Exam Masterclass: JEE, NEET & Other Competitive Exams

    Quiz included

  14. 14

    Summary