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Periodic Classification of Element

Maharashtra Board · Class 10 · Science

Complete topic list for Periodic Classification of Element in Maharashtra Board Class 10 Science. Key concepts, sub-topics, and what to focus on for board exams.

45 questions22 flashcards5 concepts

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4 Topics · Maharashtra Board Class 10 Science

Topics in Periodic Classification of Element

1

Early Classification Methods

  • Initially, elements were classified into metals, non-metals, and metalloids based on physical and chemical properties
  • Dobereiner's Triads (1817): Groups of three elements with similar properties where atomic mass of middle element equals average of other two
  • Examples of triads: Li-Na-K, Ca-Sr-Ba, Cl-Br-I
2

Mendeleev's Periodic Table

  • Developed by Dmitri Mendeleev (1869-1872) based on atomic masses and properties
  • Periodic Law: Properties of elements are periodic functions of their atomic masses
  • Arranged 63 known elements in increasing order of atomic mass
3

Modern Periodic Table

  • Based on Henry Moseley's work (1913) on atomic numbers and X-ray studies
  • Modern Periodic Law: Properties of elements are periodic functions of their atomic numbers
  • Contains 7 periods (horizontal rows) and 18 groups (vertical columns)
4

Periodic Trends

  • Valency: Determined by valence electrons, varies 1-4 across period then decreases
  • Atomic size: Decreases left to right in period (increased nuclear charge), increases down group (additional shells)
  • Metallic character: Decreases left to right in period, increases down group

Key Concepts

German scientist Dobereiner (1817) grouped elementsEnglish scientist John Newlands (1866) arrangedRussian scientist Dmitri Mendeleev (1869Henry Moseley (1913) discovered that atomicThe modern periodic table has 7

Frequently Asked Questions

What are the important topics in Periodic Classification of Element for Maharashtra Board Class 10 Science?
Periodic Classification of Element covers several key topics that are frequently asked in Maharashtra Board Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Periodic Classification of Element — Maharashtra Board Class 10 Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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