Periodic Classification of Elements
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?
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?
