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What relation about elements did dob...

What relation about elements did dobereiner want to establish ?

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What are elements?

What is an element?

What are the limitations of Dobereiner's law to triads ?

x,y and z are the elements of a Dobereiner 's tried .If the atomic mass of 'x' is 7 and that of 'z' in 39. what should be the atomic mass of the 'y' ?

Name the scientist who first gave a useful definition of element? How did he define an element?

Observe the following table and Fill it . Observations : Can you establish the same relationship with the set of elements given in the remaining rows ?

What important fact did Millikan's experiment establish ?

Chargaff did not establish that

What is diagonal relation? Give one pair of elements , that have this relation.

What is diagonal relation? Give one pair of elements, that have this relation.

VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Aluminium does not react with water at room temperature but r...

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  2. How can you explain Aluminium (Al) is a metalloid with chemical equati...

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  3. What relation about elements did dobereiner want to establish ?

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  4. The densities of calcium (ca ) and barium (Ba ) are 1.55 and 3.5...

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  5. All akali metals are solids but hydrogen is a gas with diatomic...

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  6. IF lanthanides and actinides are inserted within the table . Im...

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  7. Do you know why Newlands proposed the law of octaves ? Explain...

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  8. Why did Mendeleeff had to leave certain blank spaces in his per...

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  9. What is your understanding about Ea (2 ) O(3 ) , EsO(2) ?

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  10. Second ionization energy of an element is higher than its firs...

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  11. The calculated electron gain enthaly values for alkaline earth m...

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  12. Do you think Newland's law of octaves is correct ? Justify .

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  13. Why are lanthanides and actinides placed separately at the bot...

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  14. The second period element , for example , for example 'F' has ...

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  15. Observe the following table and Fill it . Observations ...

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  16. Observe the following table and Fill it . Observations ...

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  17. What is atomic number ?

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  18. Consider the following elements of third period of modern periodic ta...

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  19. How does the valency vary on going down a group ?

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  20. DO the atom of an element and its ion have same size ?

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