Here's why:

* Atomic Size Trend: Atomic radius generally increases as you move down a group in the periodic table. This is because the number of electron shells increases, leading to a larger atom.

* Position: Carbon and germanium are both in Group 14 (also known as Group IV) of the periodic table. Germanium is located below carbon, meaning it has more electron shells.

* Shielding Effect: The additional electron shells in germanium also increase the shielding effect, where inner electrons shield the outer electrons from the attractive force of the nucleus. This further contributes to a larger atomic radius.

Therefore, germanium has a larger atomic radius than carbon.