Question: what are anomalous electron configurations?
Answer: Question: Anomalous Electron Configurations Some Atoms, Such As Some Transition Metals And Some Elements In The Lanthanide And Actinide Series, Do Not Adhere Strictly To Hund's Rule And Pauli's Principle. The Reason The Anomalies Are Observed Is The Unusual Stability Of Both Half-filled Pnd Completely Filled Subshells.