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Why were Dobereiner , Newlands and M...

Why were Dobereiner , Newlands and Mendeleeff not 100 % successful in their classfication of elements ? Why is the modern table table relatively a better classification ? Predict the reason .

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BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. Why were Dobereiner , Newlands and Mendeleeff not 100 % successf...

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  2. Number of elements present in period - 2 of the long form per...

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  3. Nitrogen (Z=7) is the element of group V of the periodic table. Which...

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  4. Electonic configuration of an atom is 2,8,7, . To which of the ...

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  5. Which of the following is the most active metal ?

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  6. Which of the following element is belongs to 3 period and also a 17 (V...

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  7. Which of the following element belongs to the 4 period and IV B group ...

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  8. Electron affinity values of halogens are measured in

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  9. Which of the following elements are generally semi-conductors ?

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  10. Which group elements are called halogen family ?

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  11. In modern periodic table each periodic ends with

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  12. Who noted that there were groups of elements with three elements known...

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  13. Which of the following element family belongs to 16 (VIA) Group ?

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  14. Which block elements are called the inner transition elements ?

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  15. Which group elements are called Boron family ?

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  16. Which of the following group elements are called alkali metal family ?

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  17. Which block elements are called as transition metals ?

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  18. According to which of the following characteristic of an element the m...

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  19. Which of the following property is measured in 'pm' (pico meter) units...

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  20. Which of the following group elements are nitrogen family ?

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  21. By analysing which patterns the modern periodic table is proposed ?

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