The Periodic Table — Chapter Summary
ICSE · Class 9 · Chemistry
Summary of The Periodic Table for ICSE Class 9 Chemistry. Key concepts: As the number of known, J and Dobereiner's law did not.
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Overview
The periodic table is a systematic arrangement of elements. It was developed to make the study of elements easier by grouping those with similar properties together. Early attempts used atomic mass, but the modern table is based on atomic number, which gives a better basis for classification. The ta
Key Concepts
As the number of known elements
As the number of known elements increased, classification became necessary to study them in an organised way and to relate one element with another. A
J
J. W. Dobereiner grouped elements into sets of three called triads. The middle element had an atomic mass approximately equal to the average of the ot
Dobereiner's law did not arrange all
Dobereiner's law did not arrange all known elements into triads and did not fully work even within the same family. The halogen example fluorine, chlo
John Newland arranged elements in increasing
John Newland arranged elements in increasing atomic mass and observed that every eighth element had properties similar to the first. This was called t
The law worked well only
The law worked well only for lighter elements. It failed for heavier elements and placed some very different elements in the same column. It also coul
Learning Objectives
- Understand why elements need to be classified
- Learn Dobereiner's triads and their limitations
- Understand Newland's law of octaves and why it failed
- Study Mendeleev's periodic table and its main features
- Learn the importance of atomic number in the modern periodic law
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