Skip to main content
Super TutorResources
Chapter 5 of 9
QuestionsNotesFlashcardsSummaryFormulasQuizConceptsSyllabusPlan
Syllabus

Classification of Elements and Periodicity in Properties

Manipur Board · Class 11 · Chemistry

Complete topic list for Classification of Elements and Periodicity in Properties in Manipur Board Class 11 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

61 questions24 flashcards5 concepts

Interactive on Super Tutor

Studying Classification of Elements and Periodicity in Properties? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for syllabus and more.

Try Super Tutor — Free

1,000+ Class 11 students started this chapter today

4 Topics · Manipur Board Class 11 Chemistry

Topics in Classification of Elements and Periodicity in Properties

1

Historical Development of Periodic Classification

  • Johann Dobereiner (1829): Proposed Law of Triads - groups of three elements with similar properties where the middle element's atomic weight was approximately the average of the other two
  • Examples of triads: Li-Na-K (7-23-39), Ca-Sr-Ba (40-88-137), Cl-Br-I (35.5-80-127)
  • John Newlands (1865): Law of Octaves - every eighth element had properties similar to the first, like musical octaves
2

Modern Periodic Law and Table Structure

  • Henry Moseley (1913): Discovered that atomic number, not atomic weight, is the fundamental property
  • Modern Periodic Law: Properties of elements are periodic functions of their atomic numbers
  • Modern Periodic Table has 7 periods (horizontal rows) and 18 groups (vertical columns)
3

Electronic Configuration and Periodic Table

  • Element's position in periodic table directly relates to its electronic configuration
  • Period indicates the outermost principal energy level (n value)
  • Number of elements in periods: 2, 8, 8, 18, 18, 32, 32 (theoretical)
4

Classification into s, p, d, f Blocks

  • s-block: Groups 1-2, outer configuration ns¹⁻²
  • p-block: Groups 13-18, outer configuration ns²np¹⁻⁶
  • d-block: Groups 3-12, outer configuration (n-1)d¹⁻¹⁰ns⁰⁻²

Key Concepts

The journey began with Döbereiner's LawAfter Moseley's discovery of atomic numbersThe modern periodic table has 7Elements are classified based onAtomic radius decreases across a period

Frequently Asked Questions

What are the important topics in Classification of Elements and Periodicity in Properties for Manipur Board Class 11 Chemistry?
Classification of Elements and Periodicity in Properties covers several key topics that are frequently asked in Manipur Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Classification of Elements and Periodicity in Properties — Manipur Board Class 11 Chemistry?
Understand the core concepts first, then work through the 61 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.

More resources for Classification of Elements and Periodicity in Properties

All 9 chapters — Manipur Board Class 11 Chemistry Syllabus

For serious students

Get the full Classification of Elements and Periodicity in Properties chapter — for free.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for Manipur Board Class 11 Chemistry.

Try Super Tutor Free
Try the full chapter — Free