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Making In Order- Early Attempts
Chapter Name : Periodic Classification Of Elements
Sub Topic Code : 102_10_05_01_01
Topic Name : Making In Order- Early Attempts
Sub Topic Name : Dobereiner's Attempts
Introduction

Dobereiner found that some elements have similar properties and can form groups of three.

Pre-Requisites:

Atomic mass

Activity:

All triads have similar properties.

Real Life Question:

At time of Dobereiner only few elements were known. Now many more are known, so why don’t you try making more triads and become a discoverer?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Triads Groups of three elements each having similar properties.
Learning aids / Gadgets
Gadgets How it can be used
List of triads Find out what properties were common in these triads.
Real life uses :

These triads led to development of Periodic table

Places to visit :

Chemistry Lab

Practical examples around us
Examples Explainations
Halogens Cl, Br, I are halogens and were identified as one triad.
What you learn in Theory:

System of triads

What you learn in Practice:

How triads were formed

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