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Periodic Classification of Element — Chapter Summary

Maharashtra Board · Class 10 · Science

Summary of Periodic Classification of Element for Maharashtra Board Class 10 Science. Part of the Maharashtra Board Class 10 Science syllabus.

45 questions42 flashcards4 formulas & key relations5 concepts

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Overview

Notice how 118 elements are arranged in a table so that properties repeat in a regular pattern. The chapter begins with early attempts to classify elements by atomic mass, moves to Mendeleev’s periodic table, and then to the modern periodic table based on atomic number. Count the repeated patterns i

Key Concepts

Today 118 elements are known

Today 118 elements are known, while around 1800 only about 30 were known. As the number of elements increased, scientists looked for patterns in their

Dobereiner grouped elements into sets

Dobereiner grouped elements into sets of three with similar chemical properties. The atomic mass of the middle element was approximately the mean of t

All known elements could not be

All known elements could not be placed into triads, so the method was not universal.

Newlands arranged elements in increasing atomic

Newlands arranged elements in increasing atomic mass starting with hydrogen and ending with thorium. He found that every eighth element had properties

His table had 7 × 8

His table had 7 × 8 = 56 boxes, so two elements were placed in some boxes. It could not accommodate newly discovered elements well, and some elements

Learning Objectives

  • Understand why elements needed classification
  • Recall Dobereiner’s triads and their limitation
  • Explain Newlands’ Law of Octaves and its limits
  • Describe Mendeleev’s periodic table, its merits, and demerits
  • State the modern periodic law based on atomic number

Frequently Asked Questions

What are the important topics in Periodic Classification of Element for Maharashtra Board Class 10 Science?
Key topics in Periodic Classification of Element include Early Classification of Elements, Newlands' Law of Octaves, Mendeleev's Periodic Table, Problems in Mendeleev's Table. Study these first, then practise questions on each for the Maharashtra Board Class 10 board exam.
How should I revise Periodic Classification of Element for the Maharashtra Board Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Periodic Classification of Element. 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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