Which one has larger atomic radius-F or Cl?

Step-1: Introduction

The atomic radius is the distance of the electron in the outermost from the atomic nucleus.

Across a period, atomic radii decreases but it is highest for noble gas. Down the group, atomic radii increases.

Step-2:

Fluorine ($\mathrm{F}$) and Chlorine ($\mathrm{Cl}$) belong to same group 17.

The atomic radius of Chlorine is greater than the atomic radius of Fluorine. Because in a Chlorine atom, the valence electrons are in the third shell (M-shell, n=3) while in a Fluorine atom, the valence electrons are in second shell (L-shell, n=2).

Final answer

Therefore, Chlorine has larger atomic radius.