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How many elements were known when Mendel...

How many elements were known when Mendeleev started his work?

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CHETANA PUBLICATION-Periodic Classifications of ELements-EXAMPLE
  1. What was the basis of Mendeleev's classification ?

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  2. What type of relationship of elements was examined by mendeleev?

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  3. How many elements were known when Mendeleev started his work?

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  4. What is meant by periodicity according to Mendeleev?

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  5. What is Mendeleev's Periodic law?

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  6. State the law on which modern periodic table is based

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  7. How many groups are there in the modern periodic table?

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  8. What is the number of valence electrons in an element of group 1 and g...

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  9. What is the trend in the variation of valency while going down a group...

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  10. Which pair of elements do you think will have similar properties? : So...

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  11. State the merits of Mendeleev's periodic table.

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  12. What are the demerits of Mendeleev's periodic table?

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  13. Merits of Modern periodic table over Mendeleev's periodic table

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  14. What is the relationship between the electronic configuration of an el...

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  15. The atomic number of beryllium is 4 while that of oxygen is 8.Write do...

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  16. Write the electronic configuration and valency of first 20 elements.

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  17. What is the periodic trend in the variation of valency while going fro...

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  18. What is the periodic trend in the variation of valency while going dow...

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  19. Comparative study of all the four-blocks of Modern periodic table

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  20. How could the modern periodic Table remove various anomallies of Mendl...

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