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Periodic Classification of Elements

NIOS · Class 10 · Science & Tech

Quick revision notes for Periodic Classification of Elements — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

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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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Key Topics to Revise

1

Need for Classification and Early Attempts

  • By mid-19th century, over 60 elements were known, making individual study difficult
  • Classification helps in systematic study and understanding element properties
  • Early classification divided elements into metals and non-metals only
2

Dobereiner's Triads (1829)

  • J.W. Dobereiner arranged elements in groups of three called triads
  • All three elements in a triad had similar physical and chemical properties
  • Atomic mass of middle element = arithmetic mean of other two elements
3

Newlands' Law of Octaves (1864)

  • John Alexander Newlands arranged elements by increasing atomic mass
  • Every eighth element had properties similar to the first element
  • Similar to musical octaves where 8th note repeats the first
4

Mendeleev's Periodic Law and Table (1869)

  • Dmitri Mendeleev studied all 63 known elements and their compounds
  • Arranged elements by increasing atomic mass but emphasized properties over mass
  • Left gaps for undiscovered elements and predicted their properties

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Full Notes

Key Concepts

The first classification divided elements intoMendeleev stated that 'the chemicalAfter Moseley's discovery that atomic numberElements with similar electronic configurations showThe modern periodic table has 18

Frequently Asked Questions

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Periodic Classification of Elements covers several key topics that are frequently asked in NIOS Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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