36. Krypton

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.)

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SEE OTHER NOBLE GASES: Helium, Neon, Argon, Krypton, Xenon