Exceptions to Trends in atomic radius

[105618850]

I believe that there is an exception with oxygen's radius being slightly larger compared nitrogen. Are there any other exceptions with the trend in atomic radius?

[Natalie 3k]

I have read that Sb is slightly larger than Sn, but I'm not sure if this is true because I can't seem to find any more information on it

[505766240]

I've learned that there's an exception that the atomic radius of noble gases is larger than the adjacent halogen atom because noble gas atoms are held together by van der waal forces while halogen atoms are held together by covalent bonds. Van der waal forces are weaker, therefore the atoms are further apart from each other. Covalent bonds are stronger, holding the atoms closer together.

[Michelle Argueta 1E]

In general, atomic radius decreases from left to right across a period and increases from top to bottom within a group. An exception besides the one about oxygen having a slightly larger atomic radius than nitrogen is that the noble gases have a slightly larger radius than the adjacent halogen atoms.