Classification of Elements- The Periodic Table
Kerala Board · Class 10 · Science
Quick revision notes for Classification of Elements- The Periodic Table — Kerala Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.
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Historical Development of Periodic Classification
- Robert Boyle (1661) defined an element as a substance that cannot be decomposed into simpler substances
- By 1940, 91 natural elements and 17 synthetic elements were known
- Currently, more than 118 elements are known
Döbereiner's Law of Triads
- Proposed by Johann Wolfgang Döbereiner in 1829
- Elements with similar properties arranged in groups of three (triads)
- Atomic weight of middle element = average of first and third elements
Newlands' Law of Octaves
- Proposed by John Newlands in 1865
- Elements arranged in ascending order of atomic weights
- Every eighth element had similar properties (like musical octaves)
Mendeleeff's Periodic Table
- Arranged elements in ascending order of atomic weights
- 8 vertical columns (groups) divided into A and B subgroups
- 7 horizontal rows (periods)
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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