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Krypton is the sixth element with electrons in the 4p orbital. Krypton has four full shells. While the smaller noble gases are unreactive, krypton has a lower ionization energy due to its larger size to the point that it can bond with the very electronegative fluorine atom. (The wireframe indicates the boundary of the n=4 shell.)
An alternate view (shown below) of the orbitals of krypton shows an innermost 1st-shell sphere within a 2nd tetrahedral shell (dark blue) within a 3rd cubic anti-prismatic shell (light blue) within an anti-aligned 4th tetrahedral shell (brown).
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SEE OTHER NOBLE GASES: Helium, Neon, Argon, Krypton, Xenon