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Three elements X,Y and Z belong to group...

Three elements X,Y and Z belong to groups 2,15 and 17 respectivley. Predict their
number of valence electrons.

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MODERN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-EXAMPLE
  1. The third period of the long form of periodic table contains the follo...

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

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

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

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

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

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

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

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

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

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  11. What were thae criteria used by Mendeleev in creating his periodic tab...

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  12. Why do you think the noble gases are placed in a separate group?

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  13. How could modern periodic table remove various anomallies of mendeleev...

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  14. Name two elements you would expect to show chemical reactions similar ...

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  15. Name three elements that have only a single electron in their outermos...

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  16. Name two elements that have two electrons in their outermost shells

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  17. Name: three elements with filled outermost shells

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  18. Lithium, sodium, potassium are all metals that react with water to lib...

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  19. Helium is an unreactive gas and neon is gas of extermely low reactivit...

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  20. In the modern periodic table which are the metals among the first ten ...

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