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Periodic Classification of Elements — Chapter Summary

NIOS · Class 10 · Science & Tech

Summary of Periodic Classification of Elements for NIOS Class 10 Science & Tech. Part of the NIOS Class 10 Science & Tech syllabus.

44 questions40 flashcards4 formulas & key relations5 concepts

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An illustration showing a well-organized chemist's shop with medicines classified and arranged, contrasting it with a disorganized one, to explain the need for classifying elements.
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Overview

Periodic classification of elements organizes elements so that similar properties can be studied together. The need for classification became important when nearly 60 elements were known by the middle of the nineteenth century. Early attempts used atomic mass and later atomic number, leading from si

Key Concepts

The first classification of elements

The first classification of elements was into metals and non-metals. This was useful only in a limited way because some elements, such as germanium an

William Prout's work in 1815 showed

William Prout's work in 1815 showed that the atomic mass of an element remains constant, so atomic mass became a possible basis for classification.

In 1829

In 1829, J.W. Dobereiner grouped elements into sets of three called triads. In each triad, the middle element had an atomic mass nearly equal to the a

In 1864

In 1864, John Alexander Newlands arranged elements in increasing order of atomic mass and observed that every eighth element had properties similar to

In 1869

In 1869, D'mitri Mendeleev arranged 63 known elements and their compounds mainly by increasing atomic mass and stated that the chemical and physical p

Learning Objectives

  • Describe the development of classification of elements.
  • State the main features of Mendeleev's periodic table.
  • Explain the defects of Mendeleev's periodic table.
  • State the modern periodic law.
  • Describe the features of the long form of the periodic table.

Frequently Asked Questions

What are the important topics in Periodic Classification of Elements for NIOS Class 10 Science & Tech?
Key topics in Periodic Classification of Elements include Development of Classification of Elements, Dobereiner’s Triads, Newlands’ Law of Octaves, Mendeleev’s Periodic Law and Periodic Table. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Periodic Classification of Elements for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 44 practice questions on Periodic Classification of Elements. 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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