36. Krypton

Krypton is the sixth element with electrons in the 4p orbital. Krypton has four full shells. Like neon and argon, it achieves symmetrical stability without the need to hybridize its 4s and 4p orbitals. It is virtually unreactive, although its larger size causes it to have a lower ionization energy to the point that it can bond with the very electronegative fluorine atom.

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