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a. Write down the group and period of each element. 

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a. Write down the group and period of each element. 

b. What are the use of writing electronic configuration this fashion?

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a.

  Element   Group   Period
  Sc   3  4
   Ca    2  4
   Mg   2   3
   Co   9   4

b. Group and period of the element can be identified easily. In the Same way long electron configuration can be avoided.

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