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How many elements were known at the time of Mendeleev's classification of elements ?

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ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (3 Marks Questions )
  1. Name the element whose properties can be predicted on the basis of its...

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  2. Name two elements whose atomic weights were corrected on the basis of ...

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  3. How many elements were known at the time of Mendeleev's classification...

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  4. What are the groups known as ? Group 1

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  5. What are the groups known as ? Group 17

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  6. What are the groups known as ? Group 18

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  7. Name any one element of each group.

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  8. How does number of Valence electrons on moving from left to right In...

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  9. How does number of valency vary on moving from left to right In the ...

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  10. How does number of Valence electrons on moving from left to right In...

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  11. How does number of valency vary on moving from left to right In the ...

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  12. What is meant by a group in the periodic table?

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  13. Explain why the elements of the same group exhibit the same chemical b...

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  14. In which Group the inert gases are placed in the periodic table ?

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  15. A part of the periodic table is shown below with one element missing :...

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  16. A part of the periodic table is shown below with one element missing :...

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  17. A part of the periodic table is shown below with one element missing :...

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  18. Name the element whose properties can be predicted on the basis of its...

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  19. (a) What was the basis of Mendeleev's Classification of elements ? (...

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  20. Predict the formula of hydrides of carbon and silicon using Mendeleev'...

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