The element that has the smallest atomic radius is Fluorine.
Atomic radius can be defined as a property of elements in the periodic table which is the measure of the distance between the nuclei of two identical atoms bonded together.
In a periodic table, atomic radius decreases as you move across a period from left to right.
Also in the periodic table atomic radius decreases as you move up a group from bottom to top.
From the periodic table, the elements Carbon, Nitrogen , Oxygen, fluorine are in period 2.
As you move from carbon to fluorine, there is increase in attraction between the electrons as they are added to the outer shell of the elements.
Therefore, the element that has the smallest atomic radius is Fluorine.
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