The correct ordering of the listed atoms from the largest atomic radius to the lowest is K> Fe > Se > Kr.
Atomic radius is defined as the half distance of the radius of two atoms placed side by side or close to each other.
In a periodic table, the atomic radius of elements increases as you go down the group.
This is simply because of the addition of more electrons to the outermost shell of the elements.
While in the periodic table, across the period from left to right, the atomic radius decreases.
This is because of the addition of valency electrons at the same energy level.
In the arrangement of the elements in periodic table,
- K (potassium)= Group 1
- Fe (iron) = Group 8
- Se (selenium) = 16
- Kr (Krypton) = 18
Since the atomic radius increases as we go down the group from group 1 to 18, Kr is the smallest element and K the largest.
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