We are being asked why one of the given electron configurations is favored over the other.
To do this need to look at the last 2 orbitals which are different.
When filling up the orbitals, keep in mind:
Aufbau Principle→ totally fill in the lowest energy orbital first
Hund’s Rule→ electron orbitals that are degenerate (same energy) are first half-filled before they are totally filled
Why is the electron configuration of chromium 1s22s22p63s23p63d54s1 instead of 1s22s22p63s23p63d44s2?
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