Which element has the smallest atomic radius? Fluorine, Iron, Phosphorous, Potassium

actually answer should be helium

Fluorine

Explanation:

Fluorine has an atomic number of 9

Iron's is 26

Phosphorus = 15

Potassium = 19

Fluorine has the smallest number of protons, and as it is an atom, the number of protons = the number of electrons. As it has less electrons, it only has 2 shells, whereas all the other elements here have 3+ shells. This means it will have a smaller atomic radius than them.

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