Below is the structure of what should be the peptide Asn-His-Glu-Tyr. However, one of these residues has been drawn incorrectly. Identify this residue Tyr

Glu

His

Asn

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The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.