Looking at covalent radii I know the trend states that as you move from LEFT to RIGHT the radii decreases due to increased nuclear charge. Up until you hit the noble gasses like neon. Neon does not want to form a covalent bond with itself so we have to look at the van der Waal forces to determine its radii (which is bigger than Fluorine, disproving the trend).
Up until you reach Krypton, the noble gasses tend to be slightly larger than the halogen group.
I am having a hard time understanding why the noble gas Kr does follow the general trend for covalent radii in the fourth period, even though the noble gas Ne does not.
Would it be because of the greater shielding effect?
Covalent Radii of 2nd Period and 4th Period Halogen and Noble Gase.
F - 0.064 nm
Ne - 0.070 nm
Br - 0.114 nm
Kr - 0.109 nm