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Question

Among the elements of the second period pick out the element which has a smallest atomic radius.

A
F
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B
Li
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C
C
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D
Ne
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Solution

The correct option is A F
  • Along the period atomic radius decreases as the electrons gets added to same electronic orbital and thus increases effective nuclear charge.
  • As effective nuclear charge increases the atomic radius decreases and hence in second period effective nuclear charge of Fluorine is highest and hence F will have least atomic radius.

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