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The atomic number of beryllium is 4 whil...

The atomic number of beryllium is 4 while that of oxygen is 8. Write down the electronic configuration of the two and deduce their valency from the same.

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CHETANA PUBLICATION-Periodic Classifications of ELements-EXAMPLE
  1. A metal M forms an oxide having the formula M2O3. It belongs to 3rd pe...

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

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

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

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  5. What is the periodic trend observed in the variation of atomic radii d...

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  6. Classify the elements of the third period into metals and non-metals.

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  7. On which side of the period did you find the Non-metals?

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  8. What is the cause of non-metallic character of element?

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  9. What is the expected trend in the variation of non-metallic character ...

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  10. What would be the expected trend in the variation of non-metallic char...

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  11. Go through the Modern periodic table (fig2.1) and write the names one ...

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  12. Go through the Modern periodic table (fig2.1) and write the names one ...

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  13. Go through the Modern periodic table (fig2.1) and write the names one ...

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

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

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

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  17. How is the problem regarding the position of cobalt("59CO) and nickel ...

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  18. How did the position of frac(35)(17)Cl and frac(37)(17)Clget fixed in ...

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  19. Can there be an element with atomic mas 53 or 54 in between the two el...

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  20. How are isotopes of different elements placed in the Modern peridic Ta...

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