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Chlorine bromine , iodine are Doberein...

Chlorine bromine , iodine are Dobereiner's triads .How do you justify ?

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Give the outer orbit general electronic configuration of (d) Inner t...

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  2. What is a triad?

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  3. Chlorine bromine , iodine are Dobereiner's triads .How do you ju...

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

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

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  6. Hydrogen can be placed in group 1 and group 17 in the periodic table. ...

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  7. Why do inert gases have zero valency value ?

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  8. Z' element belongs to (second ) 2^(nd) group in the periodical ...

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

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  10. Which one between Na and Na^(+) would have more size ?

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  11. What are representative elements? Give their valence shell configurati...

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  12. Formation of cation is endothermic where formation of anion is ex...

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  13. Different elements exist in different physical states. However only ga...

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  14. Explain the limiation of Mendeeff's periodic table .

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  15. How are the elements divided into s, p, d and f – blocks in the Modern...

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

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

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  18. The second period element 'F' has electrons gain enthaly than...

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  19. An element has atomic number 19. where would you expect thi...

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  20. Give reason for the need of classification of element .

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