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Classification of Elements and Periodicity in Properties — Syllabus

ICSE · Class 11 · Chemistry

What Classification of Elements and Periodicity in Properties covers in ICSE Class 11 Chemistry: 4 topics, for the 2026-27 session.

45 questions58 flashcards3 formulas & key relations5 concepts

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An infographic explaining the historical need and benefits of classifying elements, such as ease of study, prediction of properties, and systematic organization.
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4 Topics · ICSE Class 11 Chemistry · 2026-27

Topics in Classification of Elements and Periodicity in Properties

1

1. Need for Classification and Early Attempts

  • About 118 elements are currently known.
  • A systematic study of elements becomes easier when elements with similar properties are grouped together.
  • Dmitri Mendeleev developed the Periodic Law in 1869 and classified elements on the basis of atomic weights.
2

2. Mendeleev's Periodic Law and Table

  • Mendeleev's Periodic Law states that the physical and chemical properties of the elements, as well as the formulae and properties of their compounds, are periodic functions of their atomic weights.
  • Mendeleev arranged elements in increasing order of atomic weights but sometimes ignored this order to keep similar elements together.
  • His table helped predict unknown elements and their properties.
3

3. Modern Periodic Law and Long Form Periodic Table

  • Henry Moseley showed that atomic number is the most fundamental property of an element and is responsible for physical and chemical behaviour.
  • Modern Periodic Law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
  • The long form periodic table is based on atomic number.
4

4. Blocks of the Periodic Table and Electronic Configuration

  • The periodic table is divided into s-block, p-block, d-block, and f-block on the basis of the subshell in which the differentiating electron enters.
  • s-block elements belong to groups 1 and 2 and have valence-shell configuration ns1 or ns2.
  • p-block elements belong to groups 13 to 18 and generally have configuration ns2 np1-6; helium is an exception.

Key Concepts

Central concept: Periodic classification of elements based on atomic number, electronic configuration, and repeating properties

Need for classificationEarly attempts at classificationMendeleev's Periodic LawDefects of Mendeleev's tableModern Periodic LawLong form periodic tableElectronic configuration and periodic tableBlocks of the periodic table

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Frequently Asked Questions

What are the important topics in Classification of Elements and Periodicity in Properties for ICSE Class 11 Chemistry?
Key topics in Classification of Elements and Periodicity in Properties include Need for Classification and Early Attempts, Mendeleev's Periodic Law and Table, Modern Periodic Law and Long Form Periodic Table, Blocks of the Periodic Table and Electronic Configuration. Study these first, then practise questions on each for Class 11 exams.
How should I revise Classification of Elements and Periodicity in Properties for Class 11 exams?
Learn the core ideas first, then work through the 45 practice questions on Classification of Elements and Periodicity in Properties. Revise 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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