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Why was the basis is classificatons of elements changed from the atomic mass to the atomic number ?

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Ionization potential curve is the graph of atomic number versus ioniza...

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  2. Newlands proposed the law of octaves . Mendeleeff suggested eight ...

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  3. Why was the basis is classificatons of elements changed from t...

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  4. Why was the basis is classificatons of elements changed from t...

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  5. What is a periodic property? How the following properties vary in a gr...

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  6. Elments in a group generally possess similar properties , but e...

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  7. Elments in a group generally possess similar properties , but e...

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  8. Name two elements that you would expect to have chemical prope...

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  9. What is a group?

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  10. What is a period in modern periodic table ?

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  11. Mendeleev's eka-aluminium is

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  12. Which one of the following elements has more electropositivity ?

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  13. Number of vertical columns in the modern periodic table are (As per IU...

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  14. A Dobereiners Triad in the following, is ........................

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  15. Which one of the following belongs to the group of atomic weights of D...

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  16. 11, 12, 13 and 14 are the atomic numbers of the elements Na, Mg, Al an...

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  17. The most electronegative element is

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  18. Raju : All the known elements at the time of Dobereiner. could not be ...

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  19. (i) Newlands proposed the law of octaves. ii) The law of octaves was ...

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  20. State and give one example for Dobereiner's law of triads and Newland'...

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