Chemistry 11 Notes for Chemistry Notes

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Periodic Classification of Elements

  1. Is a potassium atom larger, smaller or the same size as a potassium ion? Explain.
  2. Why does the atomic size increase in going down any family of the periodic table?
  3. Why do metals form positive ions and non-metals form negative ions?
  4. Which of the following pairs would have a larger size and why? (a) K or K+ (b) F or F-
  5. Why does the first ionization energy increase from left to right in a given period of the periodic table?
  6. Why ionization energy of alkali metals decreases as the atomic number increases?
  7. Why do the Oxide O-- and Sulphide S-- have negative charge?
  8. What is the basis of the classification of elements in Mendeleev’s periodic table?
  9. Why do atomic radii decrease across a period and increase in a group with the increase of atomic number?
  10. Arrange the elements Na, Li and K in the increasing order of first ionization energy.
  11. Why is the ionization energy of Lithium greater than Sodium?
  12. Compare the size of F- and Na+ with the atomic size of Neon.
  13. Why the size of Cl- ion is larger than Cl atom where as the size of K+ ion is smaller than that of K atom?
  14. State Modern Periodic law.
  15. Why ionization energy of oxygen is less than that of nitrogen?
  16. What is the basic difference between Modern Periodic Table and Mendeleev’s Periodic Table?

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