- #1
Chemist@
- 115
- 1
What causes that some elements have an electron configuration that is not in agreement with Hund's rule (Cu, Cr, Ag, Au...)? E.g. why does chromine have a valent electron configuration of 4s1 3d5 instead of 4s2 3d4. The former configuration is said to be more energetically favored, but why?