Chapter 5 of 9
Revision Notes
The Periodic Table — Revision Notes
ICSE · Class 9 · Chemistry
The Periodic Table revision notes for ICSE Class 9 Chemistry: 4 topics in quick points. Key terms: As the number of known, J and Dobereiner's law did not.
44 questions48 flashcards5 concepts
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Key Topics to Revise
1
1. Need for Classification and Early Attempts
- Classification helps in studying elements in an organized manner.
- It helps in correlating properties of elements with fundamental properties of matter.
- It helps in defining the relationship of one element with another.
2
2. Dobereiner's Triads
- J. W. Dobereiner grouped some elements into sets of three called triads.
- The middle element in a triad had an atomic mass approximately equal to the average of the other two.
- He was the first to show a clear relationship between properties of an element and its atomic mass.
3
3. Newland's Law of Octaves
- John Newland arranged elements in increasing order of atomic mass.
- He observed that every eighth element had properties similar to the first element.
- This idea was called the law of octaves, like musical notes.
4
4. Mendeleev's Periodic Table
- Mendeleev arranged 63 known elements in increasing order of atomic mass.
- He placed elements with similar properties in the same vertical column and left gaps for undiscovered elements.
- His periodic law stated that physical and chemical properties of elements are a periodic function of their atomic masses.
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Full NotesKey Concepts
As the number of known elementsJDobereiner's law did not arrange allJohn Newland arranged elements in increasingThe law worked well only
Frequently Asked Questions
What are the important topics in The Periodic Table for ICSE Class 9 Chemistry?
Key topics in The Periodic Table include Need for Classification and Early Attempts, Dobereiner's Triads, Newland's Law of Octaves, Mendeleev's Periodic Table. Study these first, then practise questions on each for Class 9 exams.
How should I revise The Periodic Table for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on The Periodic Table. Revise definitions regularly and use flashcards for quick recall before the exam.
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