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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.

f. 19K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?

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19K, 3Li, 11Na, 4Be

elements and thier electronic configuration:

19K=2,8,8,1

 3Li=2,1

 11Na=2,8,1

 4Be=2,2

The element with the smallest atomic radius is 4Be because atomic size decreases moving across a period from left to the right while it increases down a group.

 

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