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Classification of Elements and Periodicity in Properties

Punjab Board · Class 11 · Chemistry

Quick revision notes for Classification of Elements and Periodicity in Properties — Punjab Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions30 flashcards5 concepts

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Key Topics to Revise

1

Historical Development of the Periodic Table

  • In 1800, only 31 elements were known; today 118 elements have been discovered.
  • Johann Döbereiner (1829): Law of Triads – groups of three elements where the middle element's atomic weight is roughly the average of the other two, and its properties are intermediate. Examples: Li-N
  • A.E.B. de Chancourtois (1862): Arranged elements in order of increasing atomic weights on a cylinder (helical arrangement).
2

Modern Periodic Table – Structure and Organisation

  • The modern Periodic Table (long form) has 7 horizontal rows called Periods and 18 vertical columns called Groups.
  • Groups are numbered 1 to 18 as per IUPAC 1984 recommendation (replacing IA–VIIA, VIII, IB–VIIB, 0).
  • Period number = highest principal quantum number (n) of elements in that period.
3

IUPAC Nomenclature of Elements with Z > 100

  • IUPAC provides a systematic temporary naming system for newly discovered elements with Z > 100.
  • Numerical roots are used: 0=nil, 1=un, 2=bi, 3=tri, 4=quad, 5=pent, 6=hex, 7=sept, 8=oct, 9=enn.
  • The suffix 'ium' is added at the end of the combined roots.
4

Electronic Configurations and Blocks of Elements

  • The position of an element in the Periodic Table directly reflects the quantum numbers of the last orbital filled.
  • s-Block Elements: Groups 1 and 2 (ns¹ and ns²). Alkali metals and Alkaline earth metals. Highly reactive metals. Low ionization enthalpies. React vigorously with water. Example: Na, K, Mg, Ca.
  • p-Block Elements: Groups 13 to 18 (ns²np¹ to ns²np⁶). Includes metals, non-metals, and metalloids. Noble gases have completely filled orbitals (ns²np⁶) – very low reactivity.

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Full Notes

Key Concepts

The Periodic Law states that 'theThe modern Periodic Table consistsThe periodic nature of elements directlyElements are classified based onAtomic radius generally decreases across

Frequently Asked Questions

What are the important topics in Classification of Elements and Periodicity in Properties for Punjab Board Class 11 Chemistry?
Key topics in Classification of Elements and Periodicity in Properties include Periodic Table Organization and Classification, Historical Development of the Periodic Table, Chapter Overview: Classification of Elements and Periodicity in Properties. These are the concepts Punjab Board Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Classification of Elements and Periodicity in Properties — Punjab Board Class 11 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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