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Find out the valencies of the first two ...

Find out the valencies of the first two elements.

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MODERN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-EXAMPLE
  1. How do you calculate the valency of an element from its electronic con...

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  2. What is the valency of magnesium with atomic number 12 and sulphur wit...

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  3. Find out the valencies of the first two elements.

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  4. How does the valency vary in the period on going from left to right?

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

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  6. In a periodic table How do you think the tendency to lose electrons wi...

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  7. In a periodic table How would the tendency to gain electrons change as...

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  8. In a periodic table How would the tendency to gain electrons change as...

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  9. An atom of an element has electronic configuraiton 2,8,7. To which gro...

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  10. Which of the following belongs to same period same group?

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  11. The third period of the long form of periodic table contains the follo...

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  12. The third period of the long form of periodic table contains the follo...

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  13. Three elements X,Y and Z belong to groups 2,15 and 17 respectivley. Pr...

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  14. Three elements X,Y and Z belong to groups 2,15 and 17 respectivley. Pr...

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  15. A part of the periodic table is given below. The elements sodium, carb...

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  16. A part of the periodic table is given below. The elements sodium, carb...

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  17. Did doberiner's triads also exist in the columns of newlands's octaves...

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  18. What were the limitations of deberiner's calssification?

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  19. What were the limitations of newland's law of octaves?

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  20. Besides gallium which other elements have since been discovered to fil...

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