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On going through the Modern periodic tab...

On going through the Modern periodic table (fig. 2.1) it is seen that the elements Li,Be,B,C,N,O,F and Ne belong to the period - 2. Write down the electronic configuration. Is the number of valence electrons same for all these elements ?

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No, all these elements have different number of valence electrons.
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TARGET PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -Apply your knowledge
  1. How many valence electrons are there in each of these elements?

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  2. On going through the Modern periodic table (fig2.1) it is seen that th...

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  3. On going through the Modern periodic table (fig. 2.1) it is seen that ...

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  4. On going through the Modern periodic table (fig. 2.1) it is seen that ...

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  5. The elements in the third period, namely, Na, Mg, AI, Si, P, S, CI and...

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  6. What are thevalues of 'n' for the shells K,L and M?

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  7. What is the maximum number of electrons that can be accommodated in a ...

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  8. Deduce the maximum electron capacity of the shells K, L and M?

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  9. What is the relationship between the electronic configuration of an el...

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  10. The atomic number of beryllium is 4 while that of oxygen is 8. Write d...

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  11. The table on Textbook page no. 25 is made on the basis of the modern p...

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  12. What is the periodic trend in the variation of valency while going fro...

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  13. What is the periodic trend in the variation of valency while going dow...

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  14. By referring to the modern periodic table, find out the periods to whi...

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  15. State the period to which the above elements belong.

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  16. Arrange the above elements in a decreasing order of their atomic radii...

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  17. Does this arrangement match with the pattern of the second period of t...

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  18. Why this arrangement of elements is similar to the above period of the...

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  19. Which of the above elements have the biggest and the smallest atom?

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  20. By referring to the modern periodic table, find out the group to which...

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