Periodic classification of elements

1. Introduction-

2. Dobereiner’s triads and Newland’s octaves-

3. Mendeleev’s periodic table-

4. Concept of modern periodic law-

5. Introduction to modern periodic table-

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Questions-

1. Why do we need to classify elements?

2. What are Dobereiner’s triads, explain with the help of an example.

3. What was Newland’s law of octaves?

4. Why was Newland’s law of octaves rejected?

5. What was the periodic law as given by Mendeleev?

6. What were the advantages of Mendeleev’s periodic table?

7. What are the limitations of Mendeleev’s periodic table?

8. What is the modern periodic law?