8 2.3 The Periodic Table

Practice questions

Fill in the answer.

1. How many valence electrons does each of the following atoms have? (Hint: The group numbers of these elements can be used to determine the number of valence electrons. For groups 1−10, the group number equals the number of valence electrons. For groups 12−18, subtract 10 out of the group number to get the valence electrons. For group 11, the number of valence electrons can be anticipated as 11 due to the s1 electron configuration. However, there are a few exceptions in this case.)
   1. P =
   2. Sc =
   3. F =
   4. Ca =
   5. Fe =

    

   Solutions

   1. P = 2
   2. Sc = 3
   3. F = 7
   4. Ca = 2
   5. Fe = 8