2. Electron Configuration and the Periodic Table
   
   1. Without looking at the periodic table, give the group,period, and block in which the element with the electron configuration [Kr]5s ¹ is located.
      
   2. a) Without looking at the periodic table, write the group configuration for the Group 2 elements.
      b) Without looking at the periodic table,write the complete electron confiugration for the Group 2 element in the fourth period.
      c) Refer to Figure 5-6 to identify the element described in (b) above. Then write the element's noble gas notation.
      d) How does the reactivity of the element in (b) compare with the reactivity of the element in Group 1 of the same period?
      
   3. Without looking at the periodic table, identify the period, block, and group in which the element with the electron configuration [Ar]4s ² 3d ⁸ is located.
      
   4. a) Without looking at the periodic table, write the outer group electron configuration for the Group 12 element in the fifth period.
      b) Refer to the periodic table to identify the element described in (a) and to write the element's noble gas notation.
      
   5. a) Without looking at the periodic table, write the outer electron configuration for the Group 17 element in the third period.
      b) Name the element described in (a), and identify it as a metal, nonmetal, or metalloid.
      
   6. a) Without looking at the periodic table, identify the period, block, and group of an element with the electron configuration [Ar]3d ² 3d ¹⁰ 4p ³ .
      b) Name the element described in (a), and identify it as a metal, nonmetal,or metalloid.
      
   7. Into what four blocks can the periodic table be divided to illustrate the relationship between the elements' electron configurations and their placemnt in the periodic table?
      
   8. What name is given to each of the following groups of elements on the periodic table:
      a) Group 1
      b) Group 2
      c) Groups 3-12
      d) Group 17
      e) Group 18
      
   9. What are the relationships between group configuration and group number for elements in the s, p, and d blocks?
      
   10. How do the electron configurations within the same group of elements compare?
       
   11. What is the relationship between the electron configuration of an element and the period in which that element appears in the periodic table?
       
   12. List four characteristic properties of alkali metals.
       
   13. How do the properties of alkali metals compare with the alkaline earth metals?
       
   14. Which are the main group elements?
       

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