Radon (Rn) has 6 electron shells, which are also called orbits.

Here's why:

* Electron Configuration: Radon's electron configuration is [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶.

* Shell Numbers: The numbers in front of the orbitals (4, 5, and 6) represent the electron shells.

* Total Shells: You can see there are three different shell numbers (4, 5, and 6) indicating three shells. Plus, the [Xe] represents the electron configuration of Xenon, which has 5 shells. Therefore, Radon has a total of 6 electron shells.