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Periodic Classification of Element

Maharashtra Board · Class 10 · Science

Quick revision notes for Periodic Classification of Element — Maharashtra Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions42 flashcards5 concepts

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Key Topics to Revise

1

1. Early Classification of Elements

  • Elements are broadly classified as metals, nonmetals, and metalloids.
  • Today 118 elements are known.
  • Around 1800 only about 30 elements were known.
2

2. Newlands' Law of Octaves

  • John Newlands arranged elements in increasing order of atomic mass in 1866.
  • He started with hydrogen and ended with thorium.
  • He found that every eighth element had properties similar to the first.
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3. Mendeleev's Periodic Table

  • Dmitri Mendeleev developed the periodic table during 1869 to 1872 A.D.
  • He was a professor in St. Petersburg University.
  • He arranged 63 known elements in increasing order of atomic masses.
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4. Problems in Mendeleev's Table

  • Cobalt and nickel have the same whole-number atomic mass, so their sequence was ambiguous.
  • Isotopes have the same chemical properties but different atomic masses.
  • Chlorine isotopes Cl-35 and Cl-37 create a placement challenge in a mass-based table.

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Full Notes

Key Concepts

Today 118 elements are knownDobereiner grouped elements into setsAll known elements could not beNewlands arranged elements in increasing atomicHis table had 7 × 8

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?
Understand the core concepts first, then work through the 45 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.

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