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Why the third period of Modern periodic ...

Why the third period of Modern periodic table contains `8` elements and not `18`?

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The fourth period of modern periodic table includes:

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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -REVISION EXERCISE (VERY SHORT ANSWER QUESTIONS (CARRYING 2 OR 3 MARKS))
  1. How does atomic radius vary in a period and in a group? How do you exp...

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  2. Explain why cations are smaller and anions larger in radii than their ...

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  3. Why the third period of Modern periodic table contains 8 elements and ...

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  4. Name the different blocks of elements in the periodic table. Give the ...

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  5. What are transition elements ? Which of the following are not transiti...

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  6. Write the electronic configurations for the elements with atomic numbe...

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  7. Predict the periods and blocks to which each of the following elements...

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  8. What is ionization energy ? How does it change in a period as well as ...

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  9. Which element has the lowest first ionization energy?

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  10. Which of the following electronic configurations has the lowest value ...

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  11. Mg^(2+) is smaller than O^(2-) in size, throgh both have same electron...

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  12. The five successive energies of an element are 800, 2427, 3658, 25024 ...

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  13. How would you explain the fact that the first ionization enthalpy of L...

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  14. Describe the theory associated with the radius of an atom as it a. g...

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  15. What are the major differences between metals and non-metals?

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  16. Write the general outer electronic configuration of s-,p-,d- and f-blo...

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  17. The increasing order of reactivity among group 1 elements is LiltNaltK...

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  18. ELECTRON GAIN ENTHALPY

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  19. How does atomic radius of an element vary across a period fr...

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  20. Statement-1: The atomic radii of the elements of the oxygen family are...

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