Here's why:

* Electron Configuration: Xenon has an electron configuration of [Kr] 4d¹⁰ 5s² 5p⁶.

* Principal Quantum Number (n): The number "5" in the configuration represents the principal quantum number (n), which indicates the energy level.

Therefore, xenon has electrons in the n=5 energy level, specifically in the 5s and 5p orbitals.