Problem: Why is the electron configuration of chromium 1s22s22p63s23p63d54s1 instead of 1s22s22p63s23p63d44s2?

FREE Expert Solution

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 

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Why is the electron configuration of chromium 1s22s22p63s23p63d54s1 instead of 1s22s22p63s23p63d44s2?

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