The 5px orbital is degenerate with 5py in a many-electron atom.
Degenerate orbitals are orbitals that have the same energy. According to Hund's rule, when filling degenerate orbitals, electrons are first singly filled before pairing takes place.
The 5p sublevel has three degenerate orbitals namely;
Hence, among the options, the 5px orbital is degenerate with 5py in a many-electron atom.
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