Here's a breakdown:

* Smallest: Atoms like helium (He) and hydrogen (H) have radii around 0.03 nm.

* Largest: Atoms like cesium (Cs) and francium (Fr) have radii around 0.3 nm.

Important Note: This is a very broad generalization. There are some exceptions, and the exact radii of atoms can vary depending on the specific bonding environment and other factors.