Question

why is the electronic configuration of Nb anomolous​

Answer 1

The possession of a half-filled subshell (henceforth abbreviated as hfss) is neither necessary nor sufficient for there to be an anomalous configuration. There are atoms that have hfss but do not have anomalous configurations and there are atoms that have anomalous configurations but do not have hfss.

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Answer 2

Answer:

The possession of a half-filled subshell (henceforth abbreviated as hfss) is neither necessary nor sufficient for there to be an anomalous configuration. There are atoms that have hfss but do not have anomalous configurations and there are atoms that have anomalous configurations but do not have hfss.