Buckminsterfullerene is a nanoparticle characterised by spherical geometry and a hollow interior which contains how many carbon atoms?

60

The correct answer is option 1. 60.

Buckminsterfullerene, also known as C60 or a Buckyball, is a nanoparticle characterized by spherical geometry and a hollow interior. It contains **60 carbon atoms**. Therefore, the correct answer is 60.